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HomeMy WebLinkAbout6.1 HearngStgchSpdLmtChgCITY OF DUBLIN AGENDA STATEMENT SUBJECT: City Council Meeting Date: February 13, 1989 Public Hearing: Change of Speed Limit on Stagecoach Road Report by: Public Works Director Lee Thompson EXHIBITS ATTACHED: 1) Draft Ordinance 2) Report from TJKM RECOMMENDATION: 1) 4) s) Open public hearing Receive Staff presentation and public testimony Question Staff and the public Close public hearing and deliberate Waive reading and introduce ordinance establishing a 30mph speed limit for the entire length of Stagecoach Road within the City of Dublin FINANCIAL STATEMENT: Approximately $400 to change speed limit signs and pavement markings. DESCRIPTION: In 1988, the City Council approved installation of STOP signs at two intersections on Stagecoach Road: at Turquoise Street/Topaz Circle, and at Jade Circle. These STOP signs were primarily requested to aid pedestrian safety. In order to use radar for speed limit enforcement, a street with non- residential frontage or which is over forty feet wide must be surveyed every five years or when the character of the street is changed, as in the case of installing control devices. At the time that previous speed surveys were taken, 85th percentile speeds on Stagecoach Road ranged from 37 to 41 mph. The most recent survey, taken in December following the installation of STOP signs, ranged from 34 to 37 mph, a slight reduction in speeds. Stagecoach Road, a collector street approximately 1.3 miles long, currently has three different speed limits between Alcosta Boulevard and Amador Valley Boulevard. The portion within San Ramon has a speed limit of 30 mph. North of Turquoise Street in Dublin, the speed limit is 35 mph, while the portion south of Turquoise Street is 25 mph. The homes between Turquoise Street and Amador Valley Boulevard face Stagecoach Road; however, they are separated from the main travel lanes by a raised island buffer so that driveways do not directly intersect Stagecoach Road. Dublin Police Sez~ices has maintained that enforcement of the 25 mph speed limit is difficult because the 25 mph limit is not consistent with the speed surveys and therefore citations would not be upheld by the Traffic Commissioner. TJ~M, the City's Traffic Engineer, has considered all of the above aspects and recommends that the speed limit along the entire length of Stagecoach Road should be changed to 30 mph. This action would raise the speed limit in the present 25 mph portion to be more in conformance with the speed survey, ~hich will aid the police in their enforcemmnt efforts. At the same time, the speed limit in the present 35 mph portion ~ouid be ±owered in order to provide a consistent speed limit between Alcosta and Amador Valley Boulevards. Staff recommends that the City Council conduct a public hearing, waive the reading, and introduce the ordinance establishing a 30 mph speed limit on Stagecoach Road. ITEM NO._~~__ COPIES TO: City of San Ramon TJKM ORDINANCE NO. AN ORDINANCE OF THE CITY OF DUBLIN ESTABLISHING A 30 MPH SPEED LIMIT ON STAGECOACH ROAD BETWEEN AMADOR VALLEY BOULEVARD AND THE NORTHERLY CITY LIMIT The City Council of the City of Dublin does ORDAIN as follows: Section 1. Pursuant to Section 29 of City of Dublin Ordinance 55-87 (Traffic Ordinance) and Section 22357 and 22358 of the California Vehicle Code, the City Council hereby determines that the prima facie or maximum speed limit on Stagecoach Road should be 30 miles per hour. This determination is based on the engineering and traffic survey, a copy of which is attached hereto as Exhibit A. The Council hereby finds that the above-said speed limit would facilitate orderly movement of vehicular traffic and would be reasonable and safe. Section 2. The provisions of Section 1 shall be added to Chapter 14 of the City of Dublin Traffic Code. Section 3. This ordinance shall become effective thirty (30) days after its final passage and adoption by the City Council. Section 4. 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, APPROVED, AND ADOPTED this __th day of , 1989. AYES: NOES: ABSENT: Mayor ATTEST: City Clerk ` • EXHIBIT "A" TABLE I CITY OF DUBLIN SUMMARY OF SPEED SURVEY December 1988 Posted Speed Recommended Street Direction Limit 85th % 50th % Speed Stagecoach Road • NB 35 34 30 30 north of Turquoise St. SB 35 36 32 30 (12/5/88) Stagecoach Road NB 35 39 35 - north of Turquoise St. SB 35 41 35 - (1/18/88) Stagecoach Road NB . 25 37 32 30 south of Turquoise St. SB 25 35 30 30 (12/5/88) Stagecoach Road NB 25 39 34 - south of Turquoise St. SB 25 37 32 - (1/18/88) . SPOT STEED) STUDY ANALYSIS FOR THE CITY OF DUBL._IN LOCATION; STAGECOACH FAD_ 5/0 TURQUOISE S DEVELOPMENT RESIDENTIAL DIRECTION NORTHBOUND 50th PERCENTILE SPEED 32 DAY OF THE WEEK MONDAY 85th PERCENTILE SPEED 37 DATE 12/05/88 10 MPH PACE SPEED 28 TO 37 TIME OF THE DAY 11 : 15-11 :40 AM PERCENT IN PACE SPEED 85 POSTED SPEED LIMIT 25 RANGE OF SPEEDS 28 TO 46 VEHICLES OBSERVED 20 SKEWNESS INDEX 1 .3,7 CUMULATIVE SPEED CURVE SPEED NUM- PERCNT. CUMUL. (MPH) BER OF TOT_ PRCNT. 100% + :1: :;F::-F:::k:'l:::l::-F::4:: :*+ no 4 14.29 14.29 , 1 , 1 1 0 C .U0 14.2J , i i i i i.:. F 5 i"1�_ 1 I 1 I I I 1 1 31 4 30 1 17.86 32. 14 1 1 I 1 F' I I 1 14.':9 46.43 1 .-.-. I I 1 ------ I ------ 1 - ' 32 3 10.7 . 57. 14 i i , : 'F 1 , i i 33 C;% , I 1 1 1 1 1 3. 60.71 I I 1 'F: I 1 1 1 1 34 4 14.29 75.00 4: 1 1 1 1 I I 1 I I I I 1 36 1 3.57 82. 14 I 1 1 I I ' , I 1 I 1 1 1 37 1. 3.57 ;=:5.71 I ::4;: 1 1 1 1 1 I 1 I 30 2 7. 14 92.86 1 i i 1* i 39 C) 0.00 92.80 70:,;> ; __.._._..__. ; .._.....__ 1 - 1 T.--- ' ---'- I -"-'-'---- 1 ------ ' ---� I - 1 I I 1 I 41 0 0.00 96.43 I F 1 I I 1 1 I I I l 45 0 0.00 96.43 . i i 4: 1 1 I 46 1. 3.57 100.00 I =F 1 1 I 1 47 C) 0.00 100.00 .5O:.> --::F:-____ ; __--- : ----- : ---- 40 0 0.00 100.00 :F: 1 49 0 0.00 100.00 :F: 50 0 0.00 100.00 ::F: 1 1 1 1 1 1 I 51 0 0.00 100.00 .1.n'.'; : _..__.. _ -- ; ----*---- 1 - ---. ; __.... --- : - --- 52 u 0.00 100.00 � � 4: I 53 C) 0.00 100.00 , i =F: i 54 0 0.O0 100.00 F: , 55 l 0.00 100.00 30'', , : k i i I - I I 56 t) 0.00 ;.00 .00 I I 1. 1 I I I I I : * 1 1 I I I 4: ) 0.00 lL . ; 1 1 I 1 'F: I � a: 0 0.O0 100 - • .._... I I I `F: 1 I I 1 I 62 0 0.00 100.00 , i I i 1 i 64 0 0.00 100.00 ; I : 4: : I I 1 1 1 I 1 I I 1.5 l) 0.00 100.00 , i 1 :F: 1 . 66 0 0.00 100.00 I I I 4: I I I 67 0 0.00 100.00 0% -F•:k.*: F::F:4:;F::F::F::-*9:t;F: __._...__._-+ 68 t:) 0.00 .104.00 0 10 20 30 40 50 60 't_) .:PLED (MPH) . ^ . SPOT SPEED STUDY ANALYSIS FOR THE CITY OF DUBLIN LOCATION STAGECOACH RD. S/0 TURQUOISE S DEVELOPMENT RESIDENTIAL DIRECTION SOUTHBOUND 50th PERCENTILE SPEED 30 DAY OF THE WEEK MONDAY 85th PERCENTILE SPEED 35 DATE 12/05/88 10 MPH PACE SPEED 27 TO 36 TIME OF THE DAY 11 : 15-11 :40 AM PERCENT IN PACE SPEED 90 POSTED SPEED LIMIT 25 RANGE OF SPEEDS 27 TO 42 VEHICLES OBSERVED 30 SKEWNESS INDEX 1 '56 . CUMULATIVE SPEED CURVE SPEED NUM- PERCNT. CUMUL' (MPH) BER OF TOT. PRCNT' 100% +--- --------*******$*****+ 27 I 3'33 3'33 | | � I :* | | | 28 4 13'33 16'67 | . : I I * | | | 29 5 16.67 �3'33 | ' � | | ** � | | 30 7 23'33 56.67 90% | ---- ; ---- : ---- | --*- : ---- | ---- : ---- / 31 2 6.67 63.33 | / | | * | | | � 32 () O'{]O 63'33 | | | | * | | | | 33 4 13'33 76'67 | I I : * : | | | 34 2 6'67 83'33 80I | ---- | ---- | ---- : -*--| ---- | ---- | ---- : 35 l 3.33 86.67 | | / / * | � | . 36 l 3'33 90'00 | | | | * | | | | 37 l 3'53 93'33 � � / |* | | | | 38 U 0'00 93'53 70% | ---- | ---- | ---- |*--- | ---- I ---- | ---- | 39 0 U'UO 93-33 | / | |* / | | | 40 l 3'33 96.67 | � • | | * | | | | 41 U o'OU 96.67 | | | |* | | | | 42 1 3.33 100'00 60% | - | - | - *- ' ' ' ' 43 0 0'00 100'00 | | | * | | ■ . 44 0 0'00 100'00 | � � * � | | � 45 D 0'00 100'00 | � / * � | | � 46 0 O'OO 100'00 50% | ---- | ---- | ----*---- | ---- | ---- | ---- : 47 O 0'00 100'00 | � | * | 1 | | 40 0 O'OO 100'00 � | � * | | | | 49 0 0'00 100'00 | � ; * � | | � 50 O 0'00 100.00 40Z | ---- | ---- | ----*---- | ---- | ---- | ---- | ' 51 U O'Oo 10O'[X] | | | * , | � � 52 n U'U0 l0O'O0 | | | * | | | / 53 0 O'OO lOO'OO / | | * | | | . 54 0 U'oD lO0'8O 30% | ---- | *| - -- ( --- | ---- | ---- ' 55 U 0.00 100'00 | | 1 */ | | / 56 0 O'UU 100'(]O • | | | * | | | | | 57 U O'UU 100'00 | � : T | | / | � 50 () 0'00 1.00'A:0 .......... . ............ . ----- ; -- --- --. ...-H --_ | --__ | __-_ | 59 0 0'0«0 100'00 | | : *| | | | | 60 0 0'00 100.00 | | | *| / | | | 61 0 J'(x) 100'0y0 | / : * | | | / � 62 0 U'i]() lGO'UO lir:. | ---- | ---- | * | ---- | --- | ---- | ---- : 63 O 0'00 lUO'OO | / | * : | | | | 64 0 U'OU 100'0X0 | � | T | | | | | 65 0 O.[X] 100'U0 | | | * | | � | | 66 O []'OO 10O'00 0% +************T---------------------F 67 O 0.00 100.00 0 10 20 30 40 50 60 70 SPEED (MPH) • ' ` ` SPOT SPEED STUDY ANALYSIS FOR THE CITY OF DUBLIN LOCATION STAGECOACH RD' S/0 TURQUOISE S DEVELOPMENT RESIDENTIAL DIRECTION BOTH 50th PERCENTILE SPEED 31 DAY OF THE WEEK MONDAY 85th PERCENTILE SPEED 36 DATE 12/05/88 10 MPH PACE SPEED 20 TO 37 TIME OF THE DAY 11 :15-11 :40 AM PERCENT IN PACE SPEED 07 POSTED SPEED LIMIT 2� RANGE OF SPEEDS 27 TO 46 VEHICLES OBSERVED 58 SKEWNESS INDEX 1 '40 . CUMULATIVE SPEED CURVE SPEED NUM- PERCNT. CUMUL. (MPH) BER OF TOT. PRCNT' 100% +------------- ----***********+ 27 1 1 '72 1 .72 | � | | | *** | | | 28 8 13'79 15.52 | � | | | � | | | 29 5 0-62 24' 14 / ' � | | * | | | 30 12 ")0'69 44'83 90� / ---- | ---- | ---- | ---T | ---- : ---- | ---- | 31 6 I0'34 55'17 | : | / � ; | / / 32 3 5' 17 60-34 | | | | * | | | / 33 5 0.62 68'97 / | | | � : | | | 34 6 10'34 79'31 8o% | ---- | ---- | ---- | -* | ---- | ---- | ---- | 35 2 3.45 82.76 | | | ; * ; 1 | / 36 2 3'45 86'21 | | ( ! * | | | | 37 2 3'45 89'66 � | | | * ; | | � 38 2 3'45 93' 10 .:'';',',; | ---- | ---- | ---- | -+ ; ---- | ---- | ---- | 39 0 0'O0 93' 1O | | | | * | | | | 40 2 3.45 96'55 | | | |* : | | | 41 0 []'OO 96'55 | | | 1* | | | | 42 1. 1 '72 98'28 60% | ---- | ---- | ---- : :.[.- ; ---- | ---- | --- | 43 U i]'OU 98'28 | | | / :.:, ; I | � 44 O O'O0 98'p8 | | / |:* | � | / 45 0 0'[)0 98'28 | | / * | | � | 46 .1. 1 '72 100'00 50% | ---- | ---- / ----* | ---- | ---- | ---- | 47 0 O'O[> 100'00 | | | * � � 1 | 48 0 0.00 100'00 | | | :I: | | | | 49 0 0'00 100.00 | � | * / � | � 50 0 0'00 100'00 41. � | ---- | ---- | ----*-- - : ---- | ---- | ---- ' . 51 O 0.00 100'00 . | | * | | | | 52 0 0.00 100'00 | | | * | | | | 53 0 0-00 100'00 | | ( * , | | | 54 O 0.00 l00'00 30% : - : : ._ ..4:. : ---- | ---- | ---- | 55 O 0.00 100'00 | � | * | | | | 56 n O'OO lO0'OD | | | * � | | | 57 O 0.00 1[ ]'00 | | | 1'1 � | | | 58 U U'LX] 1.00':0 2�:;• | ---- | --- | ---*| :---- | ---- | --- / 59 0 0'0k0 100'00 | | | �� � ' | | | 60 O 0'00 l00'00 | | | * | | � / | 61 O 0'00 l00'00 | / | 1'| � / / � *2 [) {],00 100'00 18�: | ----| ----|---T | :----|----| --- | 63 0 0.00 lOO'[K) | � | :1: | � 1 � / 64 O 0.00 lOO'OO | | 1 4: | � / | | 65 O 0.00 lOO'O[J / | : 41 / � | | 66 0 [)'OO 100'00 B% / *************-------- ------------4- 67 U 0'00 100.00 O LO 20 30 40 50 60 70 . • SPEED (MPH) U ` . SPOT :f;PE:_E:_I:i Tt.JDY AN At-•Y`:i.I.5 E 0 F0R MI:: CITY OF DUBLIN LOCATION STAGECOACH RD. N/C) TURQUOISE S DEVELOPMENT RESIDENTIAL DIRECTION NORTHBOUND 50th PERCENTILE SPEED 30 DAY OF THE WEEK MONDAY 05th PERCENTILE SPEED 34 DATE 12/05/02 10 MPH PACE SPEED 25 TO 34 TIME OF THE DAY 11:45-12:05 PM PERCENT IN PACE SPEED 96 POSTED SPEED LIMIT 25 RANGE OF SPEEDS 25 TO 3E. VEHICLES OBSERVED 26 SKEWNESS INDEX 1 .14 CUMULATIVE SPEED CURVE SPEED NUM - PERCNT. CUMUL. (MPH) BER OF TOT. PRCNT. 100% + ------------ 4:;t:4.*1.: :::;:::: ::::' ::::::::::- 25 1 3.05 ry �-y t 1 _ I 1 I I 2"' 1 I , I '+' 1 1 I I 27 3.25 7.69 I . 1 , 1 , 22: 5 11.54 19.23 90% ; ----- ' --.--- , -- 29 i 15.30 ' I 1 . I I j4 C}L I I. I I 1 'f' I I I I I 1 31 -...:. 11 .5 - I , I 1 +- 1 I 1 I :3 11 .54 70 f -- i - 35 2 : .671 i:24- I I . ._2 r I , I * 1 1 , 34 3 11 .54 '';h._ 15 , ; ; ;;' ; I , I I , I 0 0.00 96. 15 I 1 1 1 * 1 1 36 1 3.25 1 , _CC 70% 1 - -- - 1 -- -- ; ---- I -- ; , 1 .. -. 1 5.:' 0 0.00 100.00 ' ' I 11: - 1 I I -, 0:-C 0.00 100.00 1 ; ; ;:t: ; I I .:1':J 0 0.00 100.00 ' I I , , , i 1 I :I.: , 1 ? 0 0.O] 1oo.o,l 60% I I __. .... .__ ; . 1 ______. _ 1 __._____ I _._ __- , 41 0 0.00 100.00 1 i i :4': , , I 1 , 42 0 0.00 100.00 1 i i ;k 43 0 0.00 1 00.00 ::k: I , I 44 0 0.00 100.00 50% ; --.-._.- ... - ; ----::):----- ; ------ ; - ; ; 6 0 0.00 100.00 ; ; :: , 47 1) 0.00 100.00 ; ; :4): , 1 , , 4n 0 o.no 100.00 4O::; ; - ; -------:k-----.-- ' i -- -- ' I 4'~' 0 0.00 100.00 I i ' ! ; i 50 0 0.00 100.00 I ; =s: ; ' , 51. 0 0.00 100.0 ; ; ; ?;I , I I L. ..; `2 (_l 0.00 1U0.00_ :aJ-o I ............... ! ...-.-._._. I._._._ v: _. I I ' , 5..) 0 t1-i _! ir1).i ? . ; ' 4: 1 , I , I 54 0 0.00 I.0Cl_1?l! i i : Pit i ; '; ' I Sc...: C i_ _ l i. : .vf I, ,I I i i I, , , , 5.'.. 0 0.00 .I Li).UO 20'.1. : _........ , I.._._.._•P• ; ...._.._._.._ _ I 52-} tl 0.00 1'..'•t t.t..'2) ; ; I :•I I , , , : I , I I I (-Xi 0 0.00 L00.uO .1i : 1 ----. . ; - 1 --_.._ a: ; ..---- : -.....-. - 1 _------ 1 -- --. I I I - I I:::11 0 11.00 lt.lt:)_CII.) , ' i 'k i i i ; ; , 6:5 [) t?_(.?I) 100_0t.) . , i 4: i i i i i 64 0 0.0U 100-00 21',: I !:: 1 F: I::k::k::t::p:,):,F4':_--_-__-..______--_-..__._-_^ - -_._ ... I. 65 0 0_00 10J0.00 0 1. 0 I SPEED (ti-H) . ` , � ' • . SPOT SPEED• STUDY ANALYSIS FOR THE CITY OF DUBLIN LOCATION STAGECOACH RD. N/0 TURQUOISE S DEVELOPMENT RESIDENTIAL DIRECTION SOUTHBOUND 50th PERCENTILE SPEED 32 DAY OF THE WEEK MONDAY 85th PERCENTILE SPEED 36 DATE 12/05/88 10 MPH PACE SPEED 20 TO 37 TIME OF THE DAY 11 :45-12:05 PM PERCENT IN PACE SPEED 85 POSTED SPEED LIMIT 25 RANGE OF SPEEDS 25 T0 45 VEHICLES OBSERVED 40 SKEWNESS INDEX 1 '17 CUMULATIVE SPEED CURVE SPEED NUM- PERCNT- CUMUL' (MPH) BER OF TOT. PRCNT' 100% f ---------------****T***$**-+ 25 1 'Z'50 2'50 | | | | | -** | | � 26 1 2.50 5'00 | | 1 | 4: | | � . 27 l 2'50 7'50 / |• / | * : | | | 28 l 2'50 10'00 9U% | ---- | ---- | ---- | --*- : ----| ---- | ---- | 29 4 lO'OO ��8'OO | | / | * | | | | 30 2 5'00 25'[}0 | | | | * : | | � 31 6 15'00 40'00 : | | | * ( | | � 32 5 12'50 52'50 O0% | ---- | ---- | ---- | -*--/---- | ---- | ---- | 33 6 15'00 67'5O | | � | 4: / | | � 34 3 7'50 75'00 | | | | :I: | | i � 35 3 7'50 82'50 | | | | * | | | | 36 2 5'[l0 87'50 70::: | ---- | ---- | ---- | -*-- 1---- ( ---- | ---- | 37 '2 5'00 92'50 | | | | * | | | | 38 O 0'O0 92'50 | | | | * I | | | 39 1 2'50 95'00 � | � |* | , | | 40 l 2'5() 97'5O oO� | --- | ---- | ----|*--- 1 ---- | ---- | ---- | 41. 0 O'OO 97'50 | | | |* / | | | 42 O 0'00 97'50 | | | | * | | | | 43 U 0'00 97'50 | ! | /* / | | | 44 0 0'00 97'50 5O� | ---- | ---- | ---- |*--- : -------( ---- | ---- | 45 l 2'50 lOO'OO | � | : * | | | � 46 0 0'00 100'00 | | | | * | | | | 47 0 0.00 l00'00 | ( | | * | / / | 48 0 0'00 100'00 4U'::, | ---- | - --- | ---- | *--- | ---- | ---- | ---- | 49 0 0'00 100'00 | | | . * � | | | 50 0 0'00 100'00 | | | :1: | | | | 5l 0 0'O0 100'0O | | | * | | | | 52 O 0'00 100'00 �O::, | ---- | ----|----*---- | ---- | ---- | --- | 53 O D'0O l0O.[Xl | | 1 � | | | � 54 0 O' VU 100.00 | | | * | | | | 55 0 0'11f i 100-0U | | | * | | | / 56 O O'DO !OO'VO 2:1!:; | ---- I ---- | ---*---- | ---- | -- | - --- | 57 Cl 0'00 l[X]'OU | | 1 * | | | | | 58 O O'[V] 100'00 | | | * | | | | | 59 O O'()O 100,00 | | | 4: | | | | | 60 0 0'00 100'00 lH� | ---- / ----| ---*| ----| --- | ---- | ---- | 6.1. O U'UU lLXl'UU | | | *| • I | | � 62 O 0'00 lUO'UU | | | * | 1 | | | 6.3 U 0'00 100'00 | I 1' � | 1 | | | 64 n U'UO 100-(]0 0% | ************---- 4. 65 0 O'OU 10U.0 ] L. lO 20 -.1;0 40 �O 60 70 :iF[ED (MPH) ' � ~ ^ ` ~ ' ' ` .` � � .� ' ''^'�,`���c�.���' �, '' . � • ' ` SPOT SPEED STUDY ANALYSIS FOR THE CITY OF DUBLIN LOCATION STAGECOACH RD' N/0 TURQUOISE S DEVELOPMENT RESIDENTIAL DIRECTION BOTH 50th PERCENTILE SPEED 31 DAY OF THE WEEK MONDAY 85th PERCENTILE SPEED 35 DATE 12/05/88 10 MPH PACE SPEED 27 T0 36 TIME OF THE DAY 11 :45-12:05 PM PERCENT IN PACE SPEED 07 POSTED SPEED LIMIT 25 RANGE OF SPEEDS 25 TO 45 VEHICLES OBSERVED 66 SKEWNESS INDEX 1 '20 . CUMULATIVE SPEED CURVE SPEED NUM- PERCNT' CUMUL' (MPH) BEM OF TOT. PRCNT' 100% +---------------- ***********-+ �5 2 3'()3 3'O3 | ! � | �*� � | | 26 l 1 '52 4'55 | , | | | *| / | / 27 2 3'03 7'50 | ' � | | * | . | / 28 4 6'06 13'64 90% | ---- | ---- | ---- | --*-|---- | ---- | ---- | 29 8 12' 12 25'76 | � � | * 1 | | � 30 7 10'61 36'36 | | | | * | | | ( 31 9 13'64 50'00 | | | | * | | | | 32 O 12. 12 62' 12 00% | ---- | ---- | ---- | -*-- | ---- | ---- | ---- | 35 8 12' 12 74.24 | | | | * / | | | 34 6 9'09 83'35 | | | | * | | | | 35 3 4'55 87'03 | | | |* ; | | | 36 3 4.55 92'43 70% : ---- : --- | ---- |*- / ---- | ---- | ---- | 37 2 3'03 95.45 | , | /* | | , / 38 O 0.00 95'45 | / | :* : | | / 3'71 l 1 '52 96'97 ! | | |* : | | � 40 1 1 '52 98-48 60% / ---- | ---- | ---- |*---| ---- | ---- | ---- | 41 U O'OO 90'48 | / | |T | | 1 1 42 O 0'00 98'48 | | | |* | | | i 43 O (LOU 98'48 | � � |* | | / | 44 O U'OO 98.48 50% | ----| ---- | ---- |*--- |---- | ---- | ---- | 45 l 1 '52 lOO'OU | � � * | | | | 46 O 0'00 lOU'OU | | | * | | | | 47 U O'OU 300'00 | : | * | | | | 40 •O O'OO lUO'OU 40",', | ---- | ---- | ----*---- | ---- | ---- | ---- | 49 0 0'00 ' 100'00 | / | * | , | | 50 O 0'00 100'00 | | | * | | | | 51 O 0'00 100'00 � | | � / | | | 52 0 0'00 100' 80 30% | ---- | ---- | ----*-- ' ---- ' ---- ' ---- ' . . . . 53 0 0'00 100'00 | � | * � | | | 54 O 0'0( l[o'oU • | / | � | | ' ' . . 55 O O'U0 i0O'Uo • / | *| | | | | 56 0 O'Do i00'0V0 20% | ---- | ---- | ---|' | -'- ' | --'- | -- -- | -- ' | 5./ 0 0'00 100'00 . � | � | | | | | 5• 0 O.J'n lUU'VO | � | *| | | | • �0 O O's) lUU'UU � | | • | | � | | 6[) U O'()U LOO'OU 10% | ---- / - -- / --I'| ---- | ---- | --- | -- - | 61 0 0.00 100'00 � | | * 1, � . � / 62 O U'OV lOU'O/l | ' | | � | | � | i 6:3 O O'OO 100'00 | | | T | � � | | 64 0 O'[Xl 100'00 U� �* �- |��*�* ****�*' -------------------/ 65 0 0,00 100.00 0 lO 20 30 40 50 60 `') �.;PEED 011^H0 . G SPOT SPEED STUDY ANALY i FOR THE CITY OF DUBLIN LOCATION STAGECOACH RD.S/O S.TOPAZ CIR. DEVELOPMENT RESIDENTIAL DIRECTION NORTHBOUND 50th PERCENTILE SPEED 34 DAY OF THE WEEK MONDAY 85th PERCENTILE SPEED 39 DATE O1/18/0E0 10 MPH PACE SPEED 29 TO 38 TIME OF THE DAY 10:35-10:55 AM PERCENT IN PACE SPEED 80 POSTED SPEED LIMIT 25 RANGE OF SPEEDS 25 TO 45 VEHICLES OBSERVED 25 SKEWNESS INDEX 1.23 CUMULATIVE SPEED CURVE SPEED NUM- PERCNT. CUMUL_ 25 1 4.00 4.00 26 0 0.00 4.00 27 0 0.00 4.00 28 0 0.00 4.00 90% s 29 3 12.00 16.00 . 30 3 12.00 28.00 , 31 2 8.00 36.00 , 32 2 8_00 44.00 GO% , 33 1 4.00 48.00 , 34 5 20.00 60.00 , , 35 2 8.00 76.00 , 36 0 0.00 76.00 70% , 37 0 0.00 76.00 , 38 2 8.00 84.00 , 39 1 4.00 80.00 , 40 0 0.00 80.00 60% , 41 1 4.00 92.00 , 42 1 4.00 96.00 43 0 0.O0 96.00 , 44 0 0.00 96.00 503E , 45 1 4.00 100.00 , 46 0 0.00 100.00 , 47 0 0.00 100.00 , 40 0 0.00 100.00 40% , 49 0 0.00 100.00 , 50 0 0.00 100.00 , 51 0 0.00 100.00 , 52 0 0.00 100.00 30% , 53 0 0.00 100.001 54 0 0.00 100.00 , 55 0 0.00 1001.00 , 56 0 0.00 100.00 20% , 57 0 0.00 100.00 50 0 0.00 100.00 59 0 0.00 100.00 60 0 0.00 100.00 10.E , 61" 0 0.00 100.00 62 0 0.00 100.00 YV 63 0 0.00 100.00) 64 0 0.00 100.00 0Z 65 0 0.00 100.00 0 10 20 30 40 50 60 70 SPEED (MPH) . 6 SPOT SPEED STUDY ANALYSIS • FOR THE CITY OF DUBLIN LOCATION STAGECOACH RD.S/C) S.TOPAZ CIR_ DEVELOPMENT RESIDENTIAL DIRECTION SOUTHBOUND 50th PERCENTILE SPEED 32 DAY OF THE WEEK MONDAY 85th PERCENTILE SPEED 37 DATE 01/18/80 10 MPH PACE SPEED 22 TO 37 TIME OF THE DAY 10:35-10:55 AM PERCENT IN PACE SPEED 84 POSTED SPEED LIMIT 25 RANGE OF SPEEDS 22 TO 51 VEHICLES OBSERVED 26 SKEWNESS INDEX 1.08 CUMULATIVE SPEED CURVE SPEED NUM- PERCNT. CUMUL. 22 1 3.� 5 3.85 .2.-..3 0 0.00 3.85 24 0 0.00 3_85 , 25 0 0.00 3.85 90% , 26 1 3.25 7.69 , 27 0 0.00 7.69 , 20 4 15.52 23.00 29 1 3.85 26.9,- • L' 80% , 30 1 3.85 30.77 , 31 1 3.05 34.62 , 32 4 15.38 50.00 , 33 3 11 .54 61 .54 70% , 34 1 3.8:5 65.3 : , 35 1 3.05 69.23 36 0 0.00 69.23 , 37 6 23.03 92.31 60% , 30 0 0.00 92.31 , 39 1 3.05 96. 15 , 40 0 0.00 96. 15 , 41 0 0.00 96. 15 50% , 42 0 0.00 96. 1.5 , 43 0 0.00 96. 15 , 44 0 0.00 96. 15 , 45 0 0.00 96. 15 40% , 4.6 0 0.00 96. 15 , • 47 0 0.00 96. 15 , 4S 0 0_00 96. 15 , 49 0 0.00 96. 15 30% , 50 0 0.00 96. 15 , 51 1 3.05 100.00 , 52 0 0.00 100.00 , 53 0 0.00 100.00 20% , 54 0 0.00 100.00 , 55 C) 0.00 100.00) 56 0 0.00 100.00 , 57 0 0.00 100.00 10% , 50 0 0.00 100.00 59 O 0.(IC) 100.00 , , 60 0 0.00 100.00 , 61. 0 0.00 100.00 0% 62 C) 0.00 100.00 0 10 20 30 40 50 60 70 SPEED (MPH) SPOT SPEED STUDY ANALYSIS FOR THE CITY OF DUBLIN LOCATION STAGECOACH RD_N/O S.TOPAZ CIR. DEVELOPMENT RESIDENTIAL DIRECTION NORTHBOUND 50th PERCENTILE SPEED 35 DAY OF THE WEEK MONDAY 85th PERCENTILE SPEED 39 DATE 01/18/88 10 MPH PACE SPEED 30 TO 39 TIME OF THE DAY 11 :10-11 :30 AM PERCENT IN PACE SPEED 88 POSTED SPEED LIMIT 35 RANGE OF SPEEDS 22 TO 46 VEHICLES OBSERVED 25 SKEWNESS INDEX 1.29 CUMULATIVE SPEED CURVE SPEED NUM- PERCNT. CUMUL. 22 1 4.00 4.00 , 23 0 0.00 4.00 , 24 0 0.00 4.00 „ 25 0 0.00 4.00 90% , 26 0 0.00 4.00 , 27 0 0.00 4.00 , 22 0 0.00 4.00 , 29 0 0.00 4.00 80% , 30 1 4.00 8.00 , 31 0 0.00 8.00 , 32 1 4.00 12.00 , 35 4 16.00 28.00 70% , 34 3 12.00 40.00 , 35 5 20.00 60.00 , 36 2 8.00 68.00 , 37 2 8.00 76.00 60% , 30 2 8.00 84.00 39 2 8.00 92.00 , 40 0 0.00 92.00 , 41 0 0.00 92.00 50% , 42 0 0.00 92.00 43 0 0.00 92.00 , 44 1 4.00 96.00 , 45 • 0 0.00 96.00 40% , 46 1 4.00 100.00 , 47 0 0.00 100.00 , 48 0 0.00 100.00 . 49 0 0.00 100.00 30% , 50 0 0.00 100.00 , 51 C) 0.00 100.00 , 52 0 0.00 100.00 , 53 0 0.00 100.00 20% , 54 0 0.00 100.00 , 55 0 __0.00 100.00 L 5 . 0 0.00 -- 100.00----- , 57 Cl 0.00 100.00 10% , 50 0 0.00 100.00 , 59 0 0)_00 100.00 , , , , 60 0 0.00 100.00 , 61 0 0.00 100.00 0% 62 0 0.00 100.00 0 10 20 30 40 50 60 70 SPEED (MPH) . • SPOT SPEED STUDY ANALYSIS FOR THE CITY OF DUBLIN LOCATION STAGECOACH RD.N/O S.TOPAZ CIR. DEVELOPMENT RESIDENTIAL DIRECTION SOUTHBOUND 50th PERCENTILE SPEED 35 DAY OF THE WEEK MONDAY 85th PERCENTILE SPEED 41 DATE 01/18/83 10 MPH PACE SPEED 30 TO 39 TIME OF THE DAY 11 :10-11 :30 AM PERCENT IN PACE SPEED 76 POSTED SPEED LIMIT 35 RANGE OF SPEEDS 27 TO 45 VEHICLES OBSERVED 25 SKEWNESS INDEX 1.17 • CUMULATIVE SPEED CURVE SPEED NUM- PERCNT. CUMUL. 27 1 4.00 4.00 L 2'L, 0 0.00 4.00 29 0 000 4.00 30 2 8.00 12_0C) 90% , 31 1 4.00 16.00 32 1 4.00 20.00 33 1 4.00 24.00 34 5 20.00 44.00 80% , 35 2 8.00 52.00 36 3 12.00 64.00 37 2 8.00 72.00 38 0 0.00 72.00 70% , 39 2 8.00 80.00 40 1 4.00 84.00 41 2 8.00 92.00 42 1 4.00 96.00 60% , 43 0 0.00 96.00 44 0 0.00 96.00 45 1 4.00 100.00 , 46 0 0.00 100.00 50% , 47 0 0.00 100.00 40 0 0.00 100.00 49 0 0.00 100.00 50 0 0.00 100.00 40% , 51 0 0.00 100.00 52 0 0.00 100.00 53 0 0.00 100.00 54 0 0.00 100.00 30% , , 55 0 0.00 100.00) 56 0 0.00 100.00 57 0 0.00 100.00 50 0 0.00 100.00 20% , 5':+ 0 0.00 100.00 60 0 0.00 100.00 61 0 0.00 100.00 62 0 0.00 100.00 10% , , 63 0 0.00 100.00 64 0 0.00 100.00 „ 65 0 0.00 1.00.00) 66 0 0.00 100.00 0% 67 0 0.00 100.00 0 10 20 30 40 50 60 70 SPEED (MPH) r , RECEIVED FEB 21989 PUBLIC WORKS M EMORMEMORANDUM DATE: February 2, 1989 TO: Lee Thompson FROM: Michelle DeRobertis SUBJECT: Radar Speed Survey Results on Stagecoach Road TJKM recently conducted radar speed surveys at two locations on Stagecoach Road in the City of Dublin. These locations on Stagecoach Road were north and south of Turquoise Street. These were surveyed as a follow-up to the installation of STOP signs at the intersection of Stagecoach Road and Turquoise Street. The results of the survey are summarized in Table I and the analysis sheets of the radar speed survey are attached. Stagecoach Road south of Turquoise Street has a posted speed limit of 25 miles per hour (mph) north of Turquoise Street and 35 mph south of Turquoise Street. The 85th percentile speeds prior to the installation of STOP signs on July 14, 1988, were 39 mph and 41 mph north of Turquoise Street (for northbound and southbound traffic, respectively) and 39 mph and 37 mph south of Turquoise Street (for northbound and southbound traffic, respectively). The area was resurveyed in December, 1988. The current 85th percentile speeds north of Turquoise Street are 34 mph and 36 mph (for northbound and southbound traffic, respectively). The current 85th percentile speeds for traffic south of Turquoise Street are 37 mph and 35 mph (for northbound and southbound traffic, respectively). The current speeds north of Turquoise Street are an average of five miles per hour less than in January, 1988. The current speeds south of Turquoise Street are an average of two miles per hour less than in January, 1988. It is our opinion that the reduction in speeds is most likely due to the reopening of Dougherty Road and the resulting reduction in through traffic on Stagecoach Road rather than the installation of STOP signs. In any event, speed has dropped slightly. Stagecoach Road serves a single-family residential neighborhood; however, no driveways intersect Stagecoach Road directly. North of Turquoise Street on both sides of the road and south of Turquoise Street on the east side, the houses back up to Stagecoach Road, and their driveways access internal streets. South of Turquoise Street, on the west side, the single-family homes are separated from the main travel lanes of Stagecoach Road by a raised island buffer. This in effect provides these homes with a frontage road into which they can back out of their driveways. The existing speed limit on Stagecoach Road in San Ramon is 30 mph. Together with the two speed limits posted in Dublin, there are three different speed limits on Stagecoach Road (which is approximately 1.3 miles long). 4637 Chabot Drive,Suite 214, Pleasanton,California 94566•(415)463-0611 PLEASANTON•SACRAMENTO•FRESNO.CONCORD Lee Thompson -2- February 2, 1989 Given the collector road function of the roadway, the type of frontage, and the results of the speed survey (i.e the 85th percentile speeds are 35 mph and 37 mph), it is recommended that the speed limit be raised from 25 mph to 30 mph south of Turquoise Street. North of Turquoise Street, the latest speed survey revealed that the 85th percentile speed has been lowered. Because of this fact and by considering the benefits of having a single uniform speed limit on Stagecoach Road, we also recommend that the speed limit north of Turqouise Street be reduced from 35 mph to 30 mph. In the existing 25 mph section south of Turquoise Street, 100 percent of the motorists were exceeding the posted speed limit, during our recent surveys, in spite of the new stop signs, increased enforcement and a high neighborhood awareness. The 25 mph speed limit is unrealistically low and is being disregarded. It is our opinion that a 30 mph limit is safe, is more reasonable, and has a higher chance of being obeyed by motorists. Also, it is felt that together, both these new speed limits are more appropriate than the existing posted speed limits given the results of the speed survey. They also will result in a more uniform and consistent speed limit on Stagecoach Road which should result in better compliance and easier enforcement. If you have any questions regarding this memo, please feel free to contact me. MD/mah Attachments 157-001 M.9MD