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Home My WebLink About6.01 StopSignLewis&PortageCITY OF DUBLIN AGENDA STATEMENT City Council Meeting Date: April 13, 1987 SUBJECT: Public Hearing: STOP Sign at the Intersection of Lewis Avenue and Portage Road EXHIBITS ATTACHED: RECOMMENDATION: 1) Draft Ordinance 2) Excerpt from Letter from Lyn Dinelli 3) Report from TJKM 4) 5) Open Public Hearing Receive Staff report and public testimony Question Staff and the public Close Public Hearing and deliberate Waive reading and adopt ordinance for installation of STOP sign on Lewis Ave. at intersection of Portage Road; approve installation of related improvements. FINANCIAL STATEMENT: Approximately $800 for installation of sign and pavement markings. DESCRIPTION: Staff received a request from Mrs. Lyn Dinelli of Portage Road regarding the need for traffic control at the intersection of Lewis Avenue and Portage Road. At the time her letter was written, there was not a "NO U TURN" sign posted for eastbound traffic on Lewis; however, the sign has since been replaced. findings: TJKM has investigated this intersection and presents the following Traffic Volumes Twenty-four hour traffic counts were made on March 16th and 17th. Traffic approaching from Lewis Avenue totaled 936 vehicles per day. Southbound vehicular volume on Portage Road was 180 vpd, and northbound was 847 vpd. The peak hour volume on Portage Road was 86 vehicles per hour and on Lewis Avenue was 121 vph. The primary turning movements are right turns from Lewis onto Portage and the reverse left turn from Portage onto Lewis. The average hourly volume of the eight highest hours was 148 vph. The daily approach volumes, plus high turning volumes, plus some sight distance restrictions, indicate that a STOP sign is warranted on Lewis Avenue. Review of total hourly volumes, however, indicates that STOP signs should not be installed on Portage Road. Accident History There were six reported accidents between January of 1984 and the end of March, 1987. Only one accident involved two moving vehicles; the 1. Install STOP sign, legend, and limit line on Lewis Avenue. 2. Install ceramic and reflective raised pavement markers along the existing double yellow centerline on Lewis Avenue. 3. Install raised pavement markers along the existing single yellow centerlines on all approaches to the intersection on Portage Road. Staff recommends that the City Council adopt the attached ordinance on an urgency basis and authorize Staff to implement the recommended improvements. ORDINANCE NO. 22-87 AN ORDINANCE OF THE CITY OF DUBLIN ESTABLISHING TRAFFIC REGULATIONS The City Council of the City of Dublin does ordain as follows: Section 1. STOP MANDATORY ON ALL APPROACHES: Article 4, relating to "Stop Intersections", of the Alameda County Ordinance Code previously adopted by the City of Dublin is amended by the addition of Sections 6-81.20 to read: 6-81.20 Lewis Avenue at the intersection of Portage Road. Section 2. IMMEDIATE EFFECT: This Ordinance shall take effect immediately upon its enactment because the adoption and immediate effect thereof is necessary in order to protect vehicular and pedestrian safety. Section 3. POSTING OF ORDINANCE: The City Clerk of the City of Dublin shall cause this Ordinance to be posted in at least three (3) public -places in the City of Dublin in accordance with Section 36933 of the Government Code of the State of California. PASSED AND ADOPTED by the City Council of the City of Dublin on this 13th day of April, 1987. AYES: Councilmembers Hegarty, Moffatt, Snyder, Vonheeder and Mayor Jeffery NOES: None ABSENT: None L_ Mayor ATTEST: City Clerk RECElYED FEB ]. ,3 1987 CITY OF F, UE,,LIN MEMORANDUM 4637 Chabot Drive, Suite 214 Pleasanton Ca. 94566 (415) 463-0611 DATE: April 3, 1987 TO: Lee Thompson FROM: Ty Tekawa SUBJECT: Traffic Investigation - Lewis Avenue and Portage Road Richard Ambrose received a letter from a Dublin citizen on February 13, 1987. Among various items in the letter, concern was expressed about the need for traffic control at the intersection of Lewis Avenue and Portage Road. A "blind section" at the corner was referenced, as well as the absence of a NO U-TURN sign, and accidents involving parked cars. Since this letter, a NO U-TURN sign has been installed. In response to the citizen's letter, TJKM has completed an investigation of the traffic situation at the intersection. The investigation included a field survey, traffic counts and a review of accident history. The field survey consisted of an overview of existing physical and traffic conditions. The traffic counts were used to compare traffic volumes against criteria for installing STOP signs. Accident history was reviewed to uncover any apparent patterns related to the reported collisions. Field Survey The development along Lewis Avenue is primarily commercial from Village Parkway to Portage Road. Only the corner lots at Lewis Avenue and Portage Road are single family residential. All the development fronting along Portage Road is single family residential. Both Lewis Avenue and Portage Road are forty feet wide. A double yellow centerline stripe has been painted along Lewis Avenue. Single yellow stripes are painted at the intersection approaches on Portage Road. There is a STOP sign controlling Lewis Avenue at Village Parkway. The only control at Portage Road is a NO U-TURN (R34) sign for traffic approaching on Lewis Avenue. Parking is allowed on both streets except for some red curb on Lewis Avenue near Village Parkway. All these existing features are depicted on Figure 1. Visibility to the south is somewhat limited for traffic entering the intersection on Lewis Road because of parked cars and a curve in Portage Road. Traffic Volumes Twenty-four hour machine counts were made on March 16 and 17, 1987. The counts recorded the total volume of traffic approaching the intersection from each street and also showed the hourly volumes. These volumes were checked against warrants for STOP signs (Figures 2 and 3). Traffic approaching from Lewis Avenue totaled 936 vehicles per day (vpd). Southbound vehicular volume on Portage Road was 180 vpd and northbound was 847 vpd. The peak hour volume on Portage Road was 86 vehicles per hour (vph) and on Lewis Avenue was 121 vph. The predominant traffic movements are the right turn from Lewis Avenue onto PLEASANTON · SACRAMENTO · FRESNO · CONCORD Mr. Lee Thompson -2- April 3, 1987 Portage Road and the reverse left turn movement from Portage Road onto Lewis Avenue. The average hourly volume of the eight highest hours equaled 148 vph. The sum of the daily approach volumes and the high turning volumes, plus some sight distance restrictions indicate that a STOP sign is warranted on Lewis Avenue. Review of total hourly volumes, however, indicate that STOP signs should not be installed on the Portage Road approaches. Accident History There were six reported accidents from January 1, 1984 to March 31, 1987. As shown on the collision diagram (Figure 4), there was only one accident involving two moving vehicles. All of the other accidents involved a single moving vehicle and either a parked car or a fixed object. Of the six accidents, two involved vehicles turning onto Lewis Avenue from Portage Road. One accident involved a moving southbound vehicle and a vehicle parked legally facing north. Four of the six accidents occurred in hours of darkness. A STOP sign on Lewis Avenue and some improved night-time delineation near the intersection may have helped to prevent these accidents. Recommendation Based on the field review, traffic volume counts and accident report review, it is our recommendation to implement the following improvements (see Figure 1): Install STOP sign, legend and limit line on Lewis Avenue. Install ceramic and reflective raised pavement markers along the existing double yellow centerline on Lewis Avenue. Install raised pavement markers along the existing single yellow centerlines on the approaches to the intersection on Portage Road. nlc 157-001 ~ (, DOUBLE YELLOW STRIPE~~ ~ ~-'~~ ~ ~ INSTAL~ ........ ~ ~ ~EX~TING ~ ~ ~X {~'~~-~-~-~-' x~~ .~~.~.s ,~, ,..,, R~ = STOP S~N NO SCALE LEW~S AVENUE AN9 PORTAGE ROAD RECOaUENDE9 ~aP.OVEaENTS CITY OF DUBLIN ~~ F~GURE TRANSPORTATION CONSULTANTS FIGURE 2 WARRANTS FOR TWO-WAY STOP SIGN INSTALLATION Stop sign installation may be considered if any TWO of'the following conditions exist: 1. ~0L~..~E (a) Total vehicular volume on the major street must be 500 vehicles per day or 50 vehicles per hour during the peak hour on ~n average day, (b) Total vehicular volume on the minor street must be 250 vehicles per day or 25 vehicles per hour during the peak hour on an average day, 2. ACCIDENTS Two or more of types susceptible of correction by stop signs within a 12-month period. Yield sign to be consi- dered if no other warrant is met. 3. VISIBILITY Critical approach speeds less than 15 mph. 4. UNUSUAL CONDITIONS Where 85-percentile speeds greater than 25 mph prevail or where unusual conditions exist (such as school, play- ground, steep hill, etc.) Be Stop sign installation may be considered if any ONE of the following conditions exist: 1. VOLUME (a) Total vehicular volume on the major street must be 1000 vehicles per day or 100 vehicles per hour during the peak hour on an average day. (b) Total vehicular volume on the minor street must be 500 vehicles per day or 50 vehicles per hour during the peak hour on an average day. 2. ACCIDEb~S Four or more of types susceptible of correction by stop signs within a 12-month period. 3. VISIBILITY Critical approach speeds of 10 mph or less. FIGURE 3 WARRANTS FOR FOUR-WAY STOP SIGN INSTALLATION Four-way stop sign installation may be considered if any of the following conditions exist, 1. VOLD~4E (a) Total vehicular volume entering the intersection from all approaches must average 300 per hour for any 8 hours of an average day. (24-hour equivs_l- ent approximately 4000 vehicles.) (b) In addition, the vehicular volume entering the in- tersection from the minor street or streets for the same 8 hours must average at least 1/3 of the total volume entering the intersection (100 per hour min.) 2. ACCIDENTS Five or more of types susceptible of correction by stop signs within a 12-month period, with satisfactory ob- servance and enforcement of less restrictive control. 3. VISIBILITY The straight line sight distance on one or more approach- es of the major street for vehicles or pedestrians cross- ing the intersection is less thsm 160 feet. 4. RESIDENTIAL AREA Volume warrants to be reduced to 60% of the values above if ALL of the following conditions are met~ (a) Both streets have residential frontage with existing 25 mph speed limits. (c) (a) Neither street is an adopted through street. Neither street exceeds 40 feet of roadway width. No existing stop sign or signal is located on the more heavily traveled street within a distance of 800 feet. (e) (f) Intersection has four legs, with streets extending 800 feet or more away from the intersection on at least three sides. Installation of a four-way stop is compatable with overall traffic circulation needs for the residen- tial area. ACC DATE 'I ,E /. 5'-~5- ~4 2/..5'0 (0 2. ~-2£- 85' /~ ~. ~- ~4 - ~ U~K~O~N 4. 12-12-~5 I ~00 (~) L [lJI..5 ,,~ VE FIGURE 4 LEGEND: (~ RIGHT ANGLE -(~ LEFT TURN ---(3--- REAR -END '- ~ HEAD-ON '- ~ SIDE SWIPE, REAR- EN[ ~ SIDE SWIPE, HEAD-ON PED_.~raKE PEDESTRIAN, BICYCLE ~ BACKING (L) DAYUGHT (D) DARKNESS 0 PROPERTY DAMAGE l'"l FIXED OBJECT ~) INJURY · FATAL E~ PARKED CAR ~ OUT .OF CONTROL FOR,xl CD- 2 CITY OF DU~L IiV LOCATION ,/Eidlb hVE. POD Tt~ G E PERIOD COVERED: /-/-,~4 to 3-/7-~7 DATE COMPILED-~ 3-..51-~7 ^ Traffic Control on Lewis and Portage Rd. Public Hearing April 13, 1987;signatures collected by Lyn Dinelli on 4-12-6- to represent residents unable to attend. -]°��[) Dvv� We the undersigned unable to attend the Public Hear inL, on 4-13-87 at the DublinLibrary concerning TRAFFIC CONTROL at the intersection of Lewis and Portage Rd feel that traffic control is necessary and ask the Council to do so. Siganture Address Phone L/ /'ry ' v~4�/�m ~- ^ ' � � 2 ( ��'' �*o �� Ap'� SL= �� /-� \ .~� 4 5 ��-��} \ , � ��-� -~, �-� 0 6 ' � 3 9 9 10 11 12 13 14 15 2% 1