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Home My WebLink About8.6 AnnualTrafficSafetyRpt dill ·UL ~ 7C-.d t:jl ( o ~if&-9../1.- CITY OF DUBLIN AGENDA STATEMENT City Council Meeting Date: February 25, 1991 SUBJECT: Annual Traffic Safety Report Downtown Intersection Monitoring Report (Report by Public Works Director Lee Thompson) EXHIBITS ATTACHED: 1) Traffic Safety Report 2) Downtown Traffic Monitoring Report 3) Accident Location Map will be displayed at meeting . . ' RECOMMENDATION: <~ \.\'Recei ve reports +).,..' '.+, FINANCIAL STATEMENT: Costs for recommended improvements are contained within the description below. DESCRIPTION: In 1987, the City Council directed Staff to prepare an annual Traffic Safety Report which would identify locations that incurred a significant number of traffic accidents over the previous year and make recommendations for possible improvements. The Traffic Safety Report is combined with a "downtown intersection monitoring" report as per the Downtown Specific Plan recommendation. TJKM, the City's traffic engineer, has prepared an accident location map, which will be displayed at the City Council meeting, and reports which are attached. Following is a summary of the information contained in TJKM's reports: HIGH ACCIDENT LOCATION ANALYSIS: A total of 251 reported accidents occurred in 1990. This is the lowest total since 1985. Table I of TJKM's report indicates the number of accidents by type for the previous five calendar years. Traffic volume has increased; however, the accident totals show a downward trend. TJKM has commented that the number of injury accidents is generally a better indicator than the total number of accidents, since some property damage accidents are not reported. However, the total downward trend in accidents may be attributed at least in part to Dublin's proactive approach to traffic safety and increased enforcement. There were ten locations which incurred more than five accidents. Table II of TJKM's report ranks these locations according to total number of accidents. Collision diagrams which detail the types of accidents occurring in each location are also included with the report. Analyses and recommendations for these locations are as follows: San Ramon Road Between Alcosta Boulevard and Shannon Avenue Sixteen of 22 reported accidents on this street segment are concentrated at three locations: 1) Bellina Street provides access from San Ramon Road to the San Ramon Village Plaza shopping center and to the Shell gas station. Vehicles entering San Ramon Road from Bellina Street are required to stop at a stop sign. Two accidents involved vehicles turning right from Bellina Street onto San Ramon Road which failed to yield to oncoming northbound traffic. Visibility between northbound through traffic on San Ramon Road and Bellina Street traffic entering San Ramon Road is limited by vegetation to the south along the east side of San Ramon Road. Selective removal and trimming of the vegetation is recommended. The City's maintenance staff has corrected the problem. -------~-~----------------------------------------------------------- ITEM NO ~ COPIES TO: TJKM J-k690-90 2) Six accidents occurred at the signalized intersection of San Ramon Road and Vomac Road. Five of these were rear-enders involving unsafe speed. San Ramon Road is presently one lane in each direction south of Vomac Road and transitions to two lanes in each direction north of the intersection. Rear- end accidents are common at signalized intersections. The San Ramon Road Phase IV project, which is under construction, will create a four-lane section south of Vomac Road. This widening project will shorten queues of vehicles and decrease rear-end accidents. TJKM's report recommends installing "Signal Ahead" signs and pavement markings as a temporary measure until the improvements are completed. It was subsequently noted that the "Signal Ahead" signs are already in place, and the recommendation is now to simply move the signs further ahead of the signal. The expense of pavement markings is not warranted for a situation that is temporary. 3) Eight accidents occurred at San Ramon Road and Shannon Avenue. This intersection presently does not have a protected left turn phase for drivers turning left from San Ramon Road onto Shannon Avenue. Three of the eight accidents involved drivers turning left which failed to yield to oncoming traffic. The San Ramon Road Phase IV construction will provide a protected left turn. In the meantime, TJKM recommends installing a "Left Turn Yield On Green" sign for north- and southbound traffic on the existing signal mast arms. Approximate cost of this sign installation would be $500. Dougherty Road and Dublin Boulevard/Scarlett Court Seventeen accidents occurred in the vicinity of this signalized intersection. Eight of the seventeen were concentrated at two locations. 1) Six accidents occurred on the Dublin Boulevard eastbound approach. Most were during the morning and evening peak periods. Four of the six were rear-enders. There are two separate right-turn lanes on eastbound Dublin Boulevard. Right turns on red are allowed only from the curbside lane. this contributes to uneven usage and long queues in the curbside right turn lane. However, right turns from both lanes are allowed concurrently with the northbound Dougherty Road movement to shorten the queues. A right turn green arrow indication is provided to advise drivers when right turns may be made from the second lane. Drivers sometimes do not realize that right turns may be made from the second lane because the red ball and green arrow indications appear simultaneously, which contributes to increased vehicle stacking. Rear-end accidents are not uncommon at busy signalized intersections with extended vehicle stacking. TJK~ has previously recommended capacity improvements, some of which will take place with the construction of the Dublin Boulevard Extension and Dougherty Road Improvement projects. 2) Two accidents occurred on the north side of Scarlett Court, involving vehicles backing out of the Miracle Auto Painting lot and hitting cars parked along the north curb. Removal of parking along the north side of Scarlett Court does not appear to be justified. Regional Street and Dublin Boulevard Seventeen accidents occurred in the vicinity of this signalized intersection. No particular pattern is apparent. The Regional Street northbound approach has recently been restriped to align with the southbound approach, causing the Regional Street northbound left turn loop detector to straddle the double yellow striping separating the northbound and southbound lanes of the northbound approach. Field observations indicate that the signal operation is not affected, and no further mitigations are recommended. Dougherty Road and Sierra Lane Of the 15 accidents reported at the unsignalized Dougherty/Sierra intersection, 10 actually occurred south of the intersection at a Pak N Save driveway. The City Council recently received a report regarding a proposed median closure which would prevent further accidents caused by left turns in or out of the Pak N Save driveway. Construction of the improvements is expected to take place in about a month. No further mitigation is recommended. -2- Village Parkway and Dublin Bouleva~d Ten accidents occurred in the vicinity of this signalized intersection. There is no accident pattern to indicate a need for mitigation. San Ramon Road and Dublin Boulevard Ten accidents occurred at this signalized intersection, three of which were rear-enders. These are not uncommon at busy signalized intersections and are usually caused by drivers' inattention and unsafe speed. No mitigation is recommended. San Ramon Road and Amador Valley Boulevard Nine accidents occurred at this signalized intersection. There is no accident pattern to indicate a need for mitigation. Village Parkway and Amador Valley Boulevard Eight accidents occurred at this signalized intersection, three of which involved bicycles traveling the wrong way on the north side of Amador Valley Boulevard. Bicycle circulation deficiencies were not observed in the field. No mitigation measures are recommended. Dublin Boulevard and Amador Plaza Road There were eight reported accidents at this signalized intersection. Two of these involved Amador Plaza Road southbound left turns failing to yield to northbound traffic. Standard "Left Turn Yield On Green" signs posted on the Amador Plaza Road signal mast arms is recommended to reduce driver confusion. The cost of this improvement is estimated at $500.00. Dougherty Road and 1-580 Westbound Offramp There were six accidents at this signalized intersection, one of which involved a Dougherty Road northbound vehicle running a red light and colliding with an 1-580 westbound offramp vehicle. A total of thirteen accidents of this type has occurred over the past three years. A 35 mph speed zone should be established on the Hopyard/Dougherty Road northbound overpass. Staff has requested that the City of Pleasanton establish the 35 mph speed zone. In addition, programmed signal heads should replace the standard heads on the Dougherty Road/Dublin Boulevard intersection northbound signal mast arm. The signals at the 1-580 westbound offramp and at Dublin Boulevard are viewed on the same horizontal plane as the northbound traffic approaches. The programmed heads will prevent Hopyard/Dougherty northbound traffic from reacting to the downstream Dublin Boulevard signal before the 1-580 westbound offramp signal. The cost of installing programmed heads is estimated at $3,000, and Staff is currently pursuing some alternatives for obtaining the equipment at no cost to the City. If these alternatives are not possible, Staff recommends including funds in the Signal Maintenance Operating Budget for FY1991-92 to accomplish the replacement. Three of the six accidents were Dougherty Road southbound rear-enders involving unsafe speeds. The Traffic Safety Committee has already discussed additional enforcement of the existing 35 mph Dougherty Road southbound speed limit, and new speed limit signs are planned to be posted. DOWNTOWN INTERSECTION MONITORING: The City adopted the Downtown Specific Plan in 1987. One of the recommendations contained within the Plan was to monitor traffic volumes at five downtown intersections and recommend improvements as needed. The five intersections are: San Ramon Road and Amador Valley Boulevard San Ramon Road and Dublin Boulevard Regional Street and Dublin Boulevard Village Parkway and Dublin Boulevard Dougherty Road and Dublin Boulevard -3- Table I of TJKM's report indicates the change in total traffic entering the intersection from 1987 through 1990. The Regional Street/Dublin Boulevard and Dougherty Road/Dublin Boulevard intersections showed increases during 1990. The increase at the Dougherty Road/Dublin Boulevard intersection due to residential growth in Dublin, Pleasanton, and San Ramon. of Dougherty Road has contributed to the increase by providing a attractive north-south route. is probably The widening more The increase at Regional Street/Dublin Boulevard may be due to increased downtown commercial activity to the east along Dublin Boulevard and to the north along Regional Street. Loss of volume at the San Ramon Road/Amador Valley and San Ramon Road/Dublin Boulevard intersections may be partially caused by the San Ramon Road Phase IV construction projects. Volume to capacity (V/C) ratios were calculated for each of the five intersections to determine levels of service (LOS). Table II compares the levels of service for 1988, 1989, and 1990. All of the intersections operate at an acceptable LOS of D or better, but the level of service at the Dublin Boulevard/Dougherty Road and Dublin Boulevard/Regional Street intersections has dropped from C to D. The two primary intersections of concern are Dublin Boulevard/Dougherty Road and San Ramon Road/Dublin Boulevard. The San Ramon Road/Dublin Boulevard intersection has improved from its previous LOS E rating to a high LOS D. The Dublin Boulevard/Dougherty Road intersection operates at a mid-LOS D. San Ramon Road and Dougherty Road are major commuter routes providing important north-south mobility between San Ramon and Pleasanton and access to Dublin's central business district via Amador Valley and Dublin Boulevards. The operation of the San Ramon/Dublin and Dublin/Dougherty intersections is affected by through traffic. Modifications to the San Ramon Road/Dublin Boulevard intersection contained within the Dublin Boulevard Improvement project (anticipated to be constructed during the 1991-92 fiscal year) and modifications to the Dublin Boulevard/Dougherty Road intersection contained within the Dublin Boulevard Extension and Dougherty Road Improvements projects (anticipated to be constructed during the 1991-92 and 1992-93 fiscal years) will improve capacity at these intersections. -4- (!jj!!Æ!J MEMORANDUM I' , eEl \f E D FE a 1 51991 ~UBLlc 'Ala .YYI Rks February 15, 1991 TO: Lee Thompson, City of Dublin FROM: David Othling SUBJECT: 1990 Traffic Safety Report This report documents the annual study of high accident locations on public streets in the City of Dublin. Accident data for each location are analyzed and traffic improvements to address existing safety deficiencies are recommended. Determination of High Accident Locations High accident locations were selected by reviewing the 1990 Accident Spot Map (attached). The map indicates the location and type of each accident on a base map of the City. The accident data is pulled directly from traffic collision reports prepared by Dublin police officers and submitted to TJKM. The total number of accidents by type was determined and compared with the four previous years. Table I is a comparison of total accidents by type and year for 1986 through 1990. The total number of accidents is 24 less than last year. Property damage only accidents decreased by 23 and injury accidents decreased by one over last year. There were no fatal accidents. The 251 accident total for 1990 is the lowest total since 1985. Collision diagrams (attached) were produced for intersections and street segments that had five or more accidents. Table II indicates the ten high accident locations ranked by total number of accidents. Traffic Safety Mitigation Measures 1. San Ramon Road Between Alcosta Boulevard and Shannon Avenue Sixteen of the 22 accidents on San Ramon Road between Alcosta Boulevard and Shannon Avenue are concentrated at three locations. Bellina Street is a full access intersection which is stopped signed at San Ramon Road. Bellina Street provides the only access from San Ramon Road to the San Ramon Village Plaza retail center and Shell gas station located in the southeast quadrant of the San Ramon Road/Alcosta Boulevard intersection. Two accidents involved Bellina Street right-turns not yielding to San Ramon Road northbound through traffic. 4637 Chabot Drive, Suite 214, Pleasanton, California 94588 . (415) 463-0611 PLEASANTON·SACAAMENTO·FAESNO·CONCOAD Lee Thompson -2- February 15, 1991 Visibility between San Ramon Road northbound through traffic and Bellina Street traffic entering San Ramon Road is limited by vegetation to the south along the east side of San Ramon Road. Selective removal and trimming of the curbside vegetation is recommended. No further mitigations at Bellina Street are recommended. V omac Road is signalized at San Ramon Road. Six accidents occurred here. Five of the six were rear-enders involving unsafe speed. There is only one through lane in each direction on San Ramon Road approaching Vomac Road. San Ramon Road is one lane in each direction south of Vomac Road and transitions to two lanes in each direction north of the intersection. The single through-lane approaches contribute to long queues during peak hours. Rear-end accidents are the most common at signalized intersections. Phase 4 of the San Ramon Road improvements, currently under construction, will create a four-lane road section north and south ofVomac Road. This will shorten queues and decrease rear-end accidents. To alert the drivers that they may need to slow down or stop near the intersection, it is recommended that temporary standard "Signal Ahead" signs and pavement markings be installed. These should be installed well in advance of the intersection to warn drivers behind long platoons of traffic. No further mitigations at Vomac Road are recommended. Shannon Avenue is signalized at San Ramon Road. Eight accidents occurred here. Three of the eight involved San Ramon Road northbound left turns failing to yield to southbound through traffic. Separate lanes exist for San Ramon Road northbound and southbound left-turn traffic. Drivers sometimes expect protected left-turn signal phasing in this situation. San Ramon Road left turns run at the same time as opposing through traffic so they are required to yield. A standard "Left-Turn Yield On Green" sign posted on the San Ramon Road northbound and southbound signal mast arm is recommended to reduce driver confusion. No further mitigations at Shannon Avenue are recommended. 2. Douqhertv Road and Dublin Boulevard/Scarlett Court Seventeen accidents occurred in the vicinity of the signalized intersection. Eight of the 17 accidents were concentrated at two locations. Six accidents occurred on the Dublin Boulevard eastbound approach. Most were during the morning and evening peaks. Four of the six were rear-enders. There are two separate right- turn lanes on eastbound Dublin Boulevard. Right on red is allowed only from the curbside right-turn lane. This contributes to uneven usage and long queues in the curb-side right-turn lane. Right turns from both lanes are allowed concurrently with the Dougherty Road northbound movements to shorten the queues. Drivers sometimes do not realize that right-on- red is allowed because they see the through and left-turn red ball signal indication and not the right-turn green arrow. This contributes to increased vehicle stacking. Rearend accidents are not uncommon at busy signalized intersections with extended vehicle stacking. Appropriate intersection approach widening has been recommended in previous studies (see December 6, 1990 summary memo). Some of these are planned along with the extension of Dublin Boulevard to the east. Vehicle stacking along with the associated rear-end accidents should decrease. No mitigations are recommended on the eastbound approach. Lee Thompson -3- February 15, 1991 Two accidents occurred on the north side of Scarlett Court. Both involved vehicles backing out of Miracle Auto Paint and hitting cars parked along the north curb. The accidents appear to be isolated incidents. The removal of parking on the north side of Scarlett Court will eliminate the existing deficiency, but does not appear to be justified. No mitigations on Scarlett Court are recommended. 3. Reqional Street and Dublin Boulevard Seventeen accidents occurred in the vicinity of the signalized intersection. No particular pattern of accidents is apparent on the collision diagram. The Regional Street northbound approach has been restriped to align with the southbound approach as recommended in a January 2, 1991 TJKM report. The restriping caused the Regional Street northbound left-turn loop detector to straddle the double yellow striping separating the northbound and southbound lanes of the northbound approach. Vehicles turning left from Dublin Boulevard and Regional Street southbound through traffic pass over the loop. Field observations indicate that the signal operation is not effected by the Dublin Boulevard traffic since the vehicles are not on the loop long enough for their presence to mistakenly activate the Regional Street signal phase. The Regional Street southbound traffic does take green time from Dublin Boulevard by extending the Regional Street phase. The Regional StreetJDublin Boulevard intersection signal timing is under review. No further mitigations are recommended. 4. Douqherty Road and Sierra Lane Of the 15 accidents reported at unsignalized the Dougherty Road/Sierra Lane intersection, 10 actually occurred south of the intersection at a Pak-N-Save driveway. All of these involved vehicles turning left in to or out ofPak-N-Save. A January 23,1991 TJKM study recommended the elimination of the Pak-N-Save left-turns. The City Council has agreed and the construction of a raised asphalt Dougherty Road median is planned after a traffic circulation issue in the Pak-N-Save parking lot has been resolved. No further mitigations are recommended. 5. Villaqe Parkway and Dublin Boulevard Ten accidents occurred in the vicinity of the signalized intersection. There is no accident pattern to indicate a need for mitigation. Therefore, no mitigations are recommended. 6. San Ramon Road and Dublin Boulevard There were ten accidents at the signalized intersection. Three of these were rear-enders. These are not uncommon at busy signalized intersections and are usually caused by drivers' inattention and unsafe speed. No mitigations are recommended. 7. San Ramon Road and Amador Valley Boulevard There were no patterns among the nine accidents at the signalized intersection. Therefore, no mitigations are recommended. Lee Thompson -4- February 15, 1991 8. Villaqe Parkway and Amador Valley Boulevard Eight accidents occurred at the signalized intersection. Three of these involved bikes traveling the wrong way on the north side of Amador Valley Boulevard, east and west of Village Parkway_ Bicycle circulation deficiencies were not observed in the field. Therefore, no mitigations are recommended. 9. Dublin Boulevard and Amador Plaza Road There were eight reported accidents at the signalized intersection. Two of these involved Amador Plaza Road southbound left turns failing to yield to northbound traffic. The Amador Plaza Road northbound and southbound approaches run at the same time. A standard "Left- turn Yield On Green" sign posted on the Amador Plaza Road southbound signal mast arm is recommended to reduce driver confusion. No further mitigations are recommended. 1 O. Douqherty Road and Interstate 580 Westbound Off-Ramp There were six accidents at the signalized intersection. One involved a Dougherty Road northbound vehicle running a red light and colliding with a 1-580 Westbound Off-ramp vehicle. A total of about thirteen accidents of this type have occUITed over the past three years. A 35 miles per hour (mph) speed zone should be established on the Hopyard RoadIDougherty Road northbound overpass of 1-580. Programmed signal heads should also replace the standard heads on the Dougherty RoadlDublin Boulevard intersection northbound signal mast arm. The signals at the 1-580 Westbound Off-ramp and Dublin Boulevard are viewed on the same horizontal plane as northbound traffic approaches. The programmed heads will prevent Hopyard RoadIDougherty Road northbound traffic from reacting to the downstream Dublin Boulevard signal before the 1-580 Westbound Off-Ramp signal. The mitigations are being pursued by the City based on a November 20, 1990 TJKM study. Three of the six accidents were Dougherty Road southbound rear-enders involving unsafe speeds. Additional enforcement of the existing 35 mph Dougherty Road southbound speed limit, including new speed limit signs, is planned by the City. No further mitigations are recommended. rhm Attachments 157-00lM.3DO TABLE I TRAFFIC ACCIDENTS BY YEAR Number of Accidents Accident Type 1986 1987 1988 1989 1990 Property Damage Only 224 197 207 202 179 Injury 80 58 62 73 72 Fatal 1 2 0 0 0 Total Accidents 305 257 269 275 251 TABLE II TRAFFIC ACCIDENTS BY LOCATION Number of Accident Location Accidents 1 San Ramon Road (between Alcosta Boulevard/Shannon Avenue) 22 2 Dougherty Road and Dublin Boulevard/Scarlett Court 17 3 Regional Street and Dublin Boulevard 17 4 Dougherty Road and Sierra Lane 15 5 Village Parkway and Dublin Boulevard 10 6 San Ramon Road and Dublin Boulevard 10 7 San Ramon Road and Amador Valley Boulevard 9 8 Village Parkway and Amador Valley Boulevard 8 9 Dublin Boulevard and Amador Plaza Road 8 10 Dougherty Road and 1-580 Westbound Off-Ramp 6 Total 122 ACC DATE TIME 1 01-\6-30 oi: 05l:D) 2 04 -01-90 \ ~ : 0 IlL) ':) 04- 27- ~O 16 : 2S lL) ~ O~-27-go 17 : 15 (L) 5 05-.2~- 90 15 :lS (L) 6 05-29-90 17 : ~O \l) 7 05-31-90 16 : ~ 5 l L ) ~ ~-O5-90 19 : 45 lL) 9 OG - J.l- 30 20 : 05 \L) 10 07- 2(;- 30 17 : 50 ( L) II Ob-J.5-90 12. : 10 lL) 12; 06-27-90 \7 : 50 LL) I~ 07- .(1-30 17:35lL) I~ O'ì -Ib - So \~ : l¡ 0 \ L ) IS O~ -17- 30 ¡~: 50 l:D) 16 O~-.2.\-30 07 : 30 \L) 17 O~ -.24- 90 17:QOlL) \~ O~-;17-9 o 1\ :.z 5 lL) \9 03- 01-9 o ~D~~Sl]) 20 09 - 14 - 9 o 0<6: 05 lL) W VOMAG R]). 21 10-11- .9 0 17:;¿G lL) ~¡ \O-l~- 90 1~:5G lL) (8 - æ kl flLCOsíA ßLvJ). ~1 12 A oc: z o L: a: d Z. 0:: \.f) 13 6 ~~ ~$2. 1 ~!I. 1& \-0 ~ '5h 1 - ßELl\NA sT ~ ~A(, R]). Ll::G[ND: err- KJv!-j" t.¡~Cu:: --.-s- LE F T TUíl ~J --0--- R t- A H .. [ ~ J[) --0-- H t:...\O - Ù N --..-.)- r SlOt:: :::,,"If-l, fiL.:;..R- £ ~"-n- SlOE SWIPt:, H¿AD-C 1-'. r, f i, r, B! Kt: ~ PL:;:':'~ T~jArJ, ÛICYC~l ---0."....- BACKING (L) DAYLIGHT ( D) Dt.hl\NL.:S S o l'fWi-'LHTY CAMACE o fJ,\.LD OUJL.:CT ø II.JUjU . f:~ r :.. L ["1> r-:"fÚ\U) C~H 'l.¡,~ OUT C¡': CCt.ThCìL CITY OF J)\jl:>LIN LOCATION SRIJ KI'ì MON R:D. P-.E'1'.'ifHj _hLCUST\\ ßLù] i SHRN~ON ~~E. P[f~IOO COVERED: 01-01-90'0 12-~1-90 DATE COMPILED (j1-30-91 5H[\NNON Pt\JE. - RCG :DATE TIMF - I 01- 07-90 ~l;SO\]) ¡ 01-\0·90 os : 10 \L) ?J 01-31-30 o~ :00 lL} 4 ol-ll-90 vN~NO~N 5 O;l. - \7- ~o 1 t·~ 00 \..L ) 6 oJ. -ll - 90 16:~5lL) 7 o~-Og - 90 ! \ : 00 \L) ~ O~- 1~ - gO \5: 00 \..L) 5 o~ -I~ -90 07:50(L) 10 O~ -OS -gO 17: 10 \L) II 04 -20- go 17 : ~ 7 lL-) I~ O~ - .2.6- ~o Ib : \~ lL) I~ 05-02 -~O \;( : ;( 0 \ L ) I~ 05-17-go \7 : 10 l L) CD 9 SIERRf\ LN, J9 ~ 15 06-1- 90 IO:\SlLì 16 00 -13 - gO 17 ::? 0 \L) 17 06 -01>-90 07 : 50 ll) 1~ 06-~5-go 09 : 30 lL) I~ 07-05-90 2"6: 17 \]) 20 07- Q6 - 90 06: L¡5 (L) ¡\ 07-12 -90 17: 15 (L) ¿¡ 07-2~-30 \ 5 : 50 lL.) 2J 07-27-go 16 : 0 0 lL) JA O~ - 17 - ~ 0 \J, : 15 \L) ~'J O~-)j)-~O IS : 3slL} 26 0<6 - 23 - SO \7 : 45 l L) ~7 Og-27-~O 16 : 10 \L.) 2~ II -o~-.90 I~: 15lL) LEGEND: ~~ 1~ 1= -0- -0-- : () . () . ,~~ fBIKE P£Q() ~ RIGHT ANGLE LE FT TURN REAR - DJD HEAD-ON SIDE SWIPE, REAR- EN[ SIDE SWIPE, HEAD-ON PEDESTRIAN, BICYCLE BACKING DAYUGHT DARKNESS PROPERTY DAMAGE FIXED OBJECT INJURY FATAL PARKED CAR OUT OF CO~HROL (L) (D) o o ø . 0> :D\)~UN i'JLVJ). J I~f ~ ~~ ~1 ~-(jL- I Ò 'VtA-- SeA RLETT CT. rr 5 29 11-\9-30 IDI:QOlL) ~o II .2b-30 17 :1(,\])) !JI \\-2%-90 û]:4slL) Á '62 Il-o~-30 Ib;50~L)?- ~ L..I-I :I: ~ o A CITY OF ]\J5LIN LOCATION ]O\)cr~£R1't' f\:D. E7€í~E£tJ :I)\JßL\N e,L\1), \1\11) ~\£~Rf\ L~. PERIOD COVERED: 01- 0\'" 90 to \¡-':>\- gO DATE COMPILED O.2,-OL¡ - 91 - ~cc. )I\TE. ~ T I M'E.- I 01-10-90 13 :~O tL) 2 OI-II~9O 21 :'!Jb (:D) ~ O~-lS- 90 21: I~ \]») ~ Q3-'?'b- 30 1£: ~~ ~L) 5 04 - 0 \ - 30 \7'~ I~ lL) 6 05 -01- 30 2\ : ~5 CD) 1 05-.215-'30 II ; 'b0 (L) ~ 05 -¡b-90 \b : ()O lL) 9 05- ;/}- 9 () \0 : 50 ll.) \0 OG-:¿O-gO o ~ ~ 3 ~ lL.) 9 (): 11 06-26 -90 I~:~O tL) ,¡ OG-29-30 21:55\]) 13 06 -.;1.9 -go \ 7 : 1 5 lL) I~ 07-07-90 \4:00 ~) I~ O~-03 -90 115:..22 ~q 16 CJ~ -2 G - 90 15: :'0 (L) 17 O~-\~-9O \ ~ : 12 lL) 1% 09 -19 -90 \~ : I~ lL.) \9 10 - \0 - ~o \;l. :StlL) lO \0 - IJ, - ~o 06: 10 \]) ~) 1\ -01 - go 18 : 34 \]) @ - blHJ IUìM()N R]). y fr= I~~ !2-Q-- ~ 1: 'f 2' éf 5 ~ 1 ~ ): ~ lJ. I~ -10- 30 \7:~O(J) 2, I ~ - 10 - 90 IS: S'j CD) 24 \1 - I J - 90 17 :20~]) lfJ \2 -14 - 90 17 : 10 (]) 8 3 J,;6 II-IS-90 \3:5!J(L) r£) h 27 Il-IO - go 1\ : 4 S \L) -.J cO ::::> A - 1= -0- -0-- :() . () & p~BIKE ~ (L) ( D) o o ø . D> ~ LEGEND: RIGHT ANGLE LEFT TURN REAR-END HEAD-ON SIDE SWIPE, REAR- EN[ SIDE SWIPE, HEAD-ON PEDESTRIAN, BICYCLE BACKING DAYLIGHT DARKNESS PROPERTY DAMAGE FIXED OBJECT INJURY FATAL PARKED CAR OUT OF CONTROL J£G-\ON A L Sì. L-()- ~ y ~t } -~- , '- CITY OF 1)Ù[6LIN LOCATION j)L)ßL\ tJ ß L \)1) _ ß E T'r1 E E ~ ~E("\ONI1L ST. R~:D S~~ 1<f\MOtJ 1\1), PERIOD COVERED: 01- 01- 90 to \2. - ~I- 90 DATE COMPILED Q1- 04- 9 , ACC DATE J1E I 101-05-30 \I:~S ~) ~ 02 -0<6 - 30 J(): 10 CD) 3 05-lb-30 \ D : 20 \L) 0 06-0l-30 l '6 : 00 ~L) S 06 -(j -30 I 07: 30 ~L) G 06 -IS -gO I:' :00 lL) 7 06-24-30 \~ ~~?J ~L) ~ OCJ - ).7- 90 2,\:\4 l'D) 9 \ 0 - \ :, - 90 'I¡ :00 (L) \0 in -31-Cl0 \ 7 : 00 l1)) : ~ ..J \", CD ~::ALLlN& - U:)ŒK'~ 16" I ~t J~ ~~~ :>- -;¡. ~ a... I..L1 L9 c!: -..J -..J /" 1= -0- ---0- ~ () , () . ,_~ tSIKE p~ -Q2r (L) (D) o o ø . D> '1/1IL- LEGEND: RIGHT ANGLE LEFT TURN REAR-END HEAD -ON SIDE SWIPE, REAR- EN[ SIDE SWIPE, L.1EAD-ON PEDESTRIAN, BICYCLE BACKING DAYLIGHT DARKNESS PROPERTY DAMAGE FIXED OBJECT INJURY FATAL PARKED CAR OUT OF CONTROL ]\jßU}J ßL\JJ). SP1LL~_ LOA])~ ~ ---ø--2- CITY OF ])\jßL\~ LOCATION ~ \ L L ~ S E P K ~ ~ _ At,] J) .]\)~lIN ßL\JJ). PERIOD COVERED: 0\-01-90 to \2-3\-90 DATE COMPILED- 01- O~ - 91 FOR.'. CD- 2 I COLLISION DIAGRAM @ ACC DATE T. I I 01-16 - 9 C 07:24 lLì :L O,z-\27 -30 \'6:oolJ}) J 02-2'6 -30 11 : 30 ~:D) ~ 03-0~-gC O~ : ~o lD) 5 û 4 - o~ - 30 I \?J : I 0 ~L) ----'... b 04 -o~ -go '7 : ~~ lL) 7 o ~ -I ~ - 30 \)'6:25 Clj ~ fa -:17 -gO is: 05 lL) 3 l( - 05- 90 \4 ~ 50 lLl CD 15 r 14 I ~ ~~ f A c::L 2- o :c ~ e:L- -:z ó= cD 1 -':J -0- --0-- :() . () , ,~~ fBIKE Pi£.Q ~ -'..../',,'""'""" (L) (D) o o ø . D> 1/1.t'-- W &L~M ~1}OR t;\~ ~ ~ LEGEND: RIGHT ANGLE LEFT TURN REAR-END HEAD-ON SIDE SWIPE, REAR- EN[ SIDE SWIPE, H:=:.~D·ON PEDESTRIAN, BICYCLE BACKING DAYLIGHT DARKNESS PROPERTY DAMAGE FIXED OBJECT INJURY FATAL PARKED CAR OUT OF CONTROL IJI:\ l\..E Ý ßL\J]. CITY OF 1) \.) ~ L\ i'J LOCATION S~N RI\MO~ R:D. ?'0)J) ~MI1]OR ~~LlEY ~L')J). PERIOD COVERED: 0\- 0\- 90 to I). - ~,- 90 DATE COMPILED- 02- - OS -.9 \ ¡ COLLISION DIAGRAM For,,'. CD- 2 G) - ACC DATE I .." E I I 01- ~O-9o I~:IS \L) 2 02-12.-90 \3: 00 (L) 7:J , 0 Q - \~ - 30 c20:~tJ(]) \ , l 0:) -~I- jO \?:> : 57 (. L) '-1 5 OG -1~-30 12: 30 (L) G 0'6 -G~-30 1!7;;jS (L) 7 O~-)J-30 \<j:07~L) ~ IO-~o-30 I : S ~}È7 ~ 6 CD r -a- -0- --0- ~ () 0, p~elKE ---0:-;- (L) (D) o o ø . 0> "l/!/t.- £: I ~6- LEGEND: RIGHT ANGLE LEFT TURN REAR-END HEAD -ON SIDE SWIPE, REAR- EN[ SIDE SWIPE, HEAD-ON PEDESTRIAN, BICYCLE BACKING DAYLIGHT DARKNESS PROPERTY DAMAGE FIXED OBJECT INJURY FATAL PARKED CAR OUT OF CmHROL L-o-o- For,'. CD- 2 SLV1), LOCATION ~ \ L l ~ G- E p'f( W ~ ~ ~J 1) ~H~1)OR ~~LLEY ~SUfD. PERIOD COVERED: 0\- 0\- 30 to \2. - 3 \- 30 DATE COMPILED' O:z, - O¿j- 91 ~ -> ~ 0-- LLl ø a::: -.J ---> -:::::> 'COLLISION DIAGRAM CITY OF J)Ù~LI~I ® ACC DATE T. - I OI-\~-90 20: \0 ()) :1 D~-~\-~O \ \ " 55 \L) '!J 05-0~ -30 Il ~ ~tJ lL) it 05-fQ-90 I \S: I:; \L) 5 CS-\4 -SOI10:~O (":Þ) 6 I 0 <¿ - 07 -3 c 10 : ~5 ~L) 7 0'1- 2S -SO \3 : 2 () ~L) ~ It -10 -30 \ g : ;¿O\]) I , ~ - A <:;:>L C!: N Q;:: ~ Q.... c£ o R a:: ~ cr:: FOR'. CD- 2 LEGEND: y- RIGHT ANGLE CD ~ LEFT TURN --0- REAR-END -0- HEAD-ON : ( ) SIDE SWIPE, REAR- EN! u. SIDE SWIPE, HEAD-ON ~IKE PEDESTRIAN, BICYCLE PEe: --0*- BACKING (L) DAYLIGHT (D) DARKNESS 0 PROPERTY DAMAGE 0 FIXED OBJECT 1 t ' ø INJURY I 4 1 ~ . FATAL . . D> CAR J1 PARKED "l/tIL- OUT OF CONTROL J)~~Ll N ~LV]), ~1 Tr '7 ~ CITY OF TI\J~L\~J LOCATION ÇtM~]OR ~L~ZI1 R]. ~N] ]) ~ ßLI tJ b \..IJ .:D, PERIOD COVERED: 0\-01- 90 to \1-:~\- 90 DATE COMPILED' 02-05-91 I COLLISION DIAGRAM (3) ACC DATE IE I 101-12-30 0% :40 (L) 2 OS-0\-90 O~;IO \L) Á Ot, - ,¿~- sol 16 :00 \L) '-' 4 107-24- 90 17 :L1SlL) 5 0'6 - \ ~ - 90 I ! ~ : 00 (L) Ó !\ -10- 30 I \~ : ~o It.) I A cL >- ~ \.-U :L J) ~ o A CD 15 6 ~ ~ 2 ~r t cr ---.0- --0-- -0-- . ( ) ()~ ,~~ felKE P-S2Q ~ (L) (D) o o ø . 0> '1/1IL- LEGEND: RIGHT ANGLE LEFT TURN REAR-END HEAD -ON SIDE SWIPE, REAR- EN[ SIDE SWIPE, HEAD-ON PEDESTRIAN, BICYCLE BACKING DAYLIGHT DARKNESS PROPERTY DAMAGE FIXED OBJECT INJURY FATAL PARKED CAR OUT OF CCNTROL \-59>0 Wß OFF RAMP ~ ~~ CITY OF ])DßL\N LOCATION ]O\)G-~ E R1'{ K]). ~ ~]) \-5~O ~D OFF RP'P PERIOD COVERED: 0\-0\- 90 to 12 - 5\-0,0 DATE COMPILED:02 - 01 - .91 For:,! CD- 2 l COLLISION DIAGRAM @ FEE 20 '91 15:26 TJKM TRANSPORTATION CONSULTANTS A P ::;' .~ p MEMORANDUM .: February 20, 1991 TO: Lee Thompson, City Engineer FROM: Jim Marks David Othling SUBJECT: Downtown Dublin Traffic Monitoring Background The traffic counts for the annual Downtown Dublin traffic monitoring program haV'e beencompleted. The program is part of the Downtown Specific Plan adopted in July 1987; The monitoring program consists of traffic counts taken annually at key intersections within and leading to the Downtown area. Five intersections ha'lJ'e been monitored annually since 1987. p.M. peak hour turning moV'ement counts were taken at each intersection. These intersections are: San Ramon Road! Amador Valley Boulevard San Ramon RoadIDublin Boulevard Regional StreetlDublin Boulevard Village Parkway/Dublin Boulevard Dougherty RoadIDublin Boulevard Analysis Table I indicates the change in total traffic enteriDg each intersection from 1987 through 1990. The two intersections showing increB.SaS in volumes this year are Regional Street/Dublin Boulevard and Dougherty Road/Dublin Boulevard. The increase at Dougherty RoadlDublin Boule'lJ'ard is probably due to residential growth in Dublin and through traffic involving Pleasanton and San Ramon de'Velop:ro.ent. The widening of Dougherty Road has also contributed to the traffic increase by creating a more attractive north~south inter-city route to complement Interstate 680. The increase at Regional StreetlDublin Boulevard IXlay be due to increased Downtown commercial activity to the east along Dublin Boulevard and to the north along Regional Street. 4637 ChabOt Drive. Suite 214, Pleasanton. California 94568· (41S) 463·0611 PI.EASAN'TON. SACRAMENTO· FRESNO' CONCORD FEE 21 '91 15:50 TJ~1 TRQNSPORTRTION CON9JLTRNTSR F'.:: Lee Thomp60n -2- February 21, 1991 Two of the three intersections showinll a loss of volume, San Ramon Road/Amador Valley Boulevard and San Ramon Road/Dublin Boulevard, were possibly affected by the ongoing construction of the Phase 4~San Ramon Road improvements. Volume to capacity ratios (V/C) were calculated for each of the five intersections to determine levels of service (LOS). Thè capacity analysis worksheets are attached. Table II shows a comparison of the lev~ls of service for 1988. 1989, and 1990. All of the intersections operate at an acceptable LOS D or better, but the level of service at Dougherty Road/Dublin Boulevard ând Regional StreetlDublin Boulevard has degraded from LOS C to D. I Recommendations The two primary intersections of concetn are San Ramon RoadlDougherty Road and San Ramon RoadlDublin Boulevard.: San Ramon Road/Dublin Boulevard has improved from its previous LOS E ~ating, but is near the limit of acceptable operation with a high LOS D. The Dqugherty Road/Dublin Boulevard intersection operates at a mid-LOS D. : San Ramon Road and Dougherty RQad are major coromuter routes providing important north-south mobility betweEio. San Ramon and Pleasanton and access to the heart of Dublin via Dublin Boulev~d and Amador Valley Boulevard. 1 The intersections of San Ramon Road.lriublin Boulevard and Dougherty Road/Dublin Boulevard serve :as gateways to the City, but their operation is very much affected by through traffic with origins and destinations outside of Dublin. i , The City is planning to modify the smi Ramon RoadlDublin Boulevard intersection along with the widening of Dublin Bou[evard between Village Parkway and Donlon Way. The widening project is schedu).ed for completion by the end of fiscal year 1992. The modifications will result in improved traffic carrying capacity. TJKM has also developed recommendations to upgrade the Dougherty RDad/Dublin Boulevard intersection by expanding the northboUnd. eastbound, and westbound approaches to the intersection. ' rhm Attachrnont 1ð1-OO lM.6DO FEE 20 '91 15: 27 TJKi1 TRRNSPORTHTION COliSUL THmSR P.4 TABLe I TOTAL INTERSECT10N TRAFFIC 1987 1988 1989 19901 Average % % % % Intersectioo ~ Change Volume Cha~ Volume Change Volume Cha~ - - - Safl Ramon RdJAmacIor Valley 6lvd. nç no 3,692 5.3 3,889 -14.6 3,320 -4.7 San RamOf'l RdJOublin Blvd. 5,643 4.3 5,884 1.0 5.945 -8.1 5,465 -0,93 Dublin BlvdJRegional St. 3,094 5.7 3.211 0.4 3,285 10.5 3,630 5.5 Dublin Blvd.Nillage Pkwy. 3,023 4.1 3,148 3.5 3,259 -10.2 2,926 -0,86 Dublin Blvd./Dougherty Rd. 3,528 9.2 3,863 5.2 4,054 7.5 4,360 7.3 Basad on February 1991 traftiè counts nC ~ not counted ""'- FEE 2U '°1 15:?8 TJKM TRA ~ ~ NSPORTATION CONSULTANTS A F'.5 TABLE II INTERSECTION LEVELS OF SERVICE 1988 1989 1990 Average % % "10 InterSection '!J£ bQ:! ~ Y!2. !:Q§: Change YE. LOS Change San Ramon RœdlAmador Valley Boulevard 0.73 C ~2. 7 0.71 C ~7.0 0.66 8 -4.9 San Ramon Road/Dublin Boulevard 0.94 E 2.1 0.96 E -7.3 0.89 D -2.6 DubJin BoulevardlRegional Street 0.72 C 4.2 0.75 C 13.3 0.85 D 8.8 Dublin 80ulevardNillage parkway 0.82 0 -9.8 0.74 C -9.5 0.67 6 -9.7 Dublin Boulevard/Dougherty Road 0.90 D -11.1 0.80 C 6.3 0.85 D -2.4 V/C . volume-to-capaáty ratio LOS '" level of service