HomeMy WebLinkAbout6.1 HrngChgSpdlmtStagecoach CITY OF DUBLIN
AGENDA STATEMENT
City Council Meeting Date: February 27, 1989
SUBJECT: Public Hearing: Change of Speed Limit on Stagecoach
Road (Second Reading). "
Report by: Public Works Director Lee Thompson
EXHIBITS ATTACHED: 1) Draft Ordinance
2) Report from TJKM
RECOMMENDATION: ; L) Open public hearing
2) Receive Staff presentation and public testimony
\\\ 3) Question Staff and the public
4) Close public• hearing and deliberate
5) 'Waive reading and adopt ordinance establishing a
30 mph 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:
•
This item was introduced at the City Council meeting of-February-13, 1989, at
which no public testimony was received.
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 Services 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. - -
TJKM, 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, which
will aid the police in their enforcement efforts. At the same time, the speed
limit in the present 35 mph portion would be lowered 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 adopt the ordinance establishing a 30 mph speed limit on
Stagecoach Road. •
ITEM NO. 644 COPIES TO: City of San Ramon
TJKM
ORDINANCE NO. -89
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 thi~
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 27th day of February, 1989.
AYES:
NOES:
ABSENT:
Mayor
ATTEST:
City Clerk
'~:-:: ~ . ,'-TABLE !: i .:.
CXTY OF DUBX~rN ~ .!""
SUMMARY OF SPEED SURVEY
December 1988
Strcc_t
Stagecoach Road
north of Turquoise St.
(]2/5/88)
Stagecoach Road
north of Turquoise St.
(]/]8/88)
Stagecoach Road
south of Turquoise St.
(]2/5/88)
Stagecoach Road
south of Turquoise St.
(1/18/88)
Posted.
Speed Recommended
Direction Limit .85th % ~0th % Speed
-NB 35 34 30 30
'SB 35 36 32 30
NB 35 39 35
SB 35 41 35
NB :i 25 37 32 30
SB 25 35 30 30
NB 25 39 34
SB 25 37 32
SPOT SF'EIED o FUD ¢' ANAL Fo]::z~ -- ':.'
FOR THE CITY OF []UBL]:H
LOCATIOIq
DII'~ECTIOhl
DAY OF THE WEEK
DATE
TIME OF THE DAY
POSTED SPEED LIMIT
VEI4ICL. ES OBSERVED
ST/;GE'COACH RD. S/O TURQUOISE .S DEVELOPMENT
NO RTHB OUND
MONDAY
i,:./o..,/,:,,:.,
li:15-11:40 Aid
25
50th PERCENTILE SPEED
85th PERCENTILE SPEED
10 MPH PACE SPEED
PERCENT IN PACE SPEED
RANGE OF SPEEDS
SKEWHESS INDEX
RESIDENTIAL
S2
· -,o TO 37
SS
· ",o TO 46
1.35
CUMULATIVE-SPEED CURVE
PERCFIT.
OF TOT.
14.2'5'
0.00
. . ,Z,f.],
14.. ,: ::
10.71
3.57
14 '7'':'
'-' !_,,3
C).
C,'. 0 ~_,
I..~L.,
0."
0 _ O0
L, U
C). "'
3.57
'-'
O. OO
O. uO
C.',. 0 0
ID _ O O
0.0 C!
t..) L.,
L'~. '-
'" ,
0. t'! Q
"'! i
O.
L). t: L':
C). 0:1
O. O0
CL;I'IL.IL.
PRCNT.
14.29
. ~..:~
32.14
46.45
57.14
60. 7.1
/1.:,. 57
,:,c..14
,.4,~,..:.~ .:~
? 6.4 :S
'?:,. 43
5' 6.4 3
,_,U _ O0
l ~.,U - CIO
I 0 0.0 Q
I )0. Cu3
1 L L:. t.)LI
.l O0.
7[ k!O. UO
100% +
90% ,
80% [ ....
70% ',
SPOT SPEED STUDY AD.IAL'Y$IS ---
FOR THE CITY OF DUBLIN
LOCA'FIOI,I STAGEC;F.)ACH RD. S/O TUR.F_.HJOISE S DEVELOPMENT RESIDENTIAL
DIRECTION
DAY OF' THE WEEK
DATE
TIME OF THE DAY
POSTEI) SPEED LIHIT
VEHICLE:-.'; OBSERVFD
SOUTHBOUND 50th PERCENTILE SPEED .30
MONDAY 85th PERCENTILE SPEED 35
12/05/g8 10 MPH PACE SPEED 27 TO 3G
11:15.-11:40 AM PERCENT IN PACE SPEED 90
25 RANGE OF SPEEDS 27 TO 42
:3,0 SKEHNESS INDEX 1 ....,G
.:,F EEL
( M P H )
2,..3
0.3
0.3
45
4-7
50
51
,::~ .i
5':'
I,.IUH-
BER
1 ~. 5.5 5..5 .-$
4 i5. k';5 16.67
5 1 E, _ E, 7
7 "'= '-"-' 56 "-'
~ ..-... d .~' . I~,/
'-' 6. g7 ~,~ 5._%
4. 1,3..'i;.~ ? 6. ,'=", 7
[_ ~, . ~,/' O.J .
1 ::-;. ,3.3 ,z,~: g7
,:~. j,;.
· I , 'i. ,31 ~ '. :7 .i. ,-J.5
0 O. 00 93.3:.-3
;-~ f-) O{ 'i ':"-":
I ?;./J3 '-' .......
,.) L., . '- ,I., %~J:, . ¢:, ,'
.......
8. 0. ;'I "~ 1
(} 0 _C]i) I00.
0 O. 30 - 10[). O0
(j) {]. :30 lO0.
C) O. O0 lO0. O0
(~ 0. ():'ii
0 "' (-:0 lO0
0 0. ""
n [_) (,(,
...... . j ..L L,tJ.
0 ~-~ 013
,..r'"' ~.-~o {ii.}
[~,, FI ,_,~, .~_ u,., .
.. . (_]~., .
('l 0 - ,', I_ 0,3 "'""
8 t",t I
8 ;;.,..,"' ~ .,'
I1 }..:.t'"
' i I'" '"
t,: I,.J. [.)L: .L l ',t..l.
ill 8. [J8
L', 0. {')0 ,1.00. I'll')
0 i.~. U8 J.
6UHULATIVE-SPEED CURVE
F'E F;CI'.~'T. CLIHUL.
OF 'rOT_ PRCNT.
100% +
90% "
,
t') .L 0 20 $ 0 40 5iD (;0 70
SPOT SF'EED STUDY ANALYSIS
FOR THE CITY OF' DUBI_IN
LOCATION
STAGECOACH RD. S/O TURQIJOISE S DEVELOPIflEI, IT RESTDEI, ITIAL
BOTH
12/05/gg
50t:h PERCENTILE SPEED
o~th PERCE1`,ITILE SPEED
10 HPH PACE SPEED ,-,o
,.:.,_:, TO J7
PERCENT IN PAbE SPEED 87
RANGE OF SPEEDS 27 TO 4~
oKc. l,,,l'lE.~., INDEX i 40
DIRECTION
DAY OF THE NEEK
DATE
TIME OF THE DAY
POSTED SPIEED LIMIT
VEHICLES
SPEED I',IUI'I -
(MPH) BER
27 1
2C:'
~,,0 12
751 6
34. ;:'-,
.'--. ?
¥ 9
4."] ,:-
4 i.
4 .'-.:_' J.
4 ':,
45
46
47
4::: 0
49
50
5 t
ti '? i '!
:-- ':
=:" ;'
6 C) i .,'
,'-, U ~ ')
,':,. I
;:, 5
t:, ,' :,
(:, 7
Pl'~'" ^=v,,u.SPEED CURVE
I I :~: I I I I
'
' : I
'SPOT SF'EED STUDY ANALYSZ$
FOR THE CITY OF DUBLTN
LOCATIOI',I
ST/,,GECC~ACH RD. N/O 'FLJRQUOISE S DEVELOPMENT RESIDENTIAL
I'.IORTHB OUr.ID
IdONF) AY
J.. 2/o5/
11: 45'-1'-'
,-_:05 PH
25
26
50th PERCENTILE SPEED
85th PERCENTILE SPEED
10 HPH PACE SPEED 25 TO S4
PERCENT IN PACE SPEED 96
RANGE OF SPEEDS 25 TO
E;KEI4NESS II,iDEX 1o 14
D I RECT I Ol'q
DAY ([IF THE 'dEEi<
DATE
TIME OF TliE DAY
POSTED SPEED [_IHIT
VEHICLES OBSERVED
SPEED Nt. Jrl-
(MPH) BER
25 J.
,:.,.:) O
27
' <' 4
U].
[5,:'[.
...~ .., ~-~
,5')
4. [ ')
44.
4 ,':5
47
51
5 .'i.
., .
,":, I 'l I ~
' I
F:, ,:. I"~
6> z.I
.. ,:. ~.~
F E F~E.,'.I T.
OF' TOT.
0.00
11
..'.)
[ J.. $4
J.j.
].. L . .5,q-
0.00
T, '-'"
(1 ," ,-,
'-'
0. '"" ('
() ,--,,-,
C). l.) C.'-'
[.1 _ 0 0
0.
O. Or3
'"'
,,. ,.,: )
!'3. i.
," 1. t .I; ',
il. i','( I
[.}. jcl
t3.
SPOT SPEED STLIDY ANALYSIS
FOR THiE CITY OF' I)UBLZN
LOCATIOI, I
D I F,' E C l' I 0 lq
DAY OF 'f'HE WEEK
DATE
TIME 0i::: THE DAY
POSTED SPEED LIMIT
VEHICLES F)BSERVED
STAGIECOACH RD. N/O TURQUOISE S DEVELOPHEHT
SOUTHBOIJI'ID 50th PERCEI'.ITIt_E SPEED
MUI',IDA /
11:4..,' .,..- :d., PH
L:i5th PERCENTILE SPEED
10 HPH PACE SPEED
F'ERCEhI'r IN PACE SPEED
RAHGE OF SPEED3
SI<ENHESS INDEX
RESIDEHTIAL
.-52'
TO j7
TO 45
1_17
SPEED HUM-
(MPH) BER
25
J1
.-.'.; .5 ,'3
4.]. '"
Zl. 4- 0
· ':1. 5
Z' -;' I'-)
5 [
5 ,"' O
· :, I
,'!i,,"l. [ ]
,,:., ,)
C!.,,,.¢~_ATIVE SPEED CtJRVE
F'ERCIqT -
OF TOT_
"~ ,::,U
'"
2 - 50
1 C; _ C]
15. O0
12- 50
.15. C)
? ;:~ .)
7'- 50
$ _
0. 3C)
2.50
2 _ 5 0
C,. C,,':')
C}. {.)
0. O 0
O. O0
2 - "- "]
0.00
0.08
0. C} 0
0.
o. i3C}
(']. 8 L}
0.
~..~ ~
0.
i...~.
i..i.
CUMUL
PRE;hIT
2 _
= O0
7.5,'.1~
J. O _ 0[:~
20.
40.
,S7.50
-":: E;[q
S-"Y. 50
'? 7'. 50
I 08 . CI,'.'
~ "-'q ['.'.'C]
[1'~0. '""
t'}l
100;,, -t
,
',
I
l
I
,
60.% ', ...... ' .... ---'
i I I '" I I I
,
]C'.'.',; i ............ , ' '- , ...... ~ .... ' '
,-~-,,:~h¢. ~,. ~ :,....,-. ~. ·
"";~"Z';',::~' -~:.,'-''
SPOT SPEED
FOR THE CZTY OF DUBLZN .... . : '
LOCATION STAGECOACH RD. N/O TUROUOZSE'S DEVELOPMENT RESZDENTZAL
DIRECT]iON BOTH
50th 'PERCENTIt_E SPEED
DAY OF TI-IE 14EEK
DATE
TIME OF TliE DAY
LIF,.,.T
POSTED ':.' PEED .
~EH.I. CLEo C:,G SERVE[)
MONDAY
i2/os/8
11:45-1.2:05 PPI
2.5
85th PERCENTILE SPEED
lO MPH P~CE SPEED
PERCENT IN PACE SPEED
RANGE OF SPEEDS
SKENI4ESS INDEX
,31
35
27 TO ~6
87
25 TO 45
1.20
SPEED r, ltJH--
(MPH) BER
,~c-, 1
U.O 7
51 9
~,, 4 ,:5
.2, .J ,3,
44)
· 'T 4 C:
4 ,:~
4 ,:;;,
q. ',i: 0
4 '?
5 .l
,..) ~ '.. ,..,
S,':,
i; 0
':' 1, I.'}
,::;,: '; {11
F--',,I
CtJHULAT'IVE ',SPEED CURVE
PER£,r,I
OF T C:,T.
3. OJ
. b o
12.1::_'
J.O. all
].,5. ~~'
! 2.12
9.09
0.
C,.
I,,,;
.q ,",,'~
.,i.
f).
[-.1. :3.',-!
!l). f'.,~;
F). i.):;
i'). I. :l '~
:'t ,~ .'.
().
il}. ('il')
i..',_
,ti
i'}. "'
SPOT SPEED STUDY ANALYS"~?i
FOR THE CITY OF' DUBLIN
LOCATION STAGECOACH RD.S/O S.TOPAZ
DIRECTION NORTHBOUND
DAY OF THE WEEK MONDAY
DATE 01/18/88
TIME OF THE DAY 10:35-10:55 AM
'POSTED SPEED LIMIT 25
VEHICLES OBSERVED 25
CIR.
D~-VELOPHENT
50th PERCENTILE SPEED
85th PERCENTILE SPEED
'lO HPH PACE SPEED
PERCENT IN PACE SPEED
RANGE OF SPEEDS
SKEWNESS INDEX
RESIDENTIAL
54
29 TO 58
80
25 TO 45
1.23
CUMULATIVE
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
29 ' J 12.00 16.00
50 5 12.00 28.00
51 2 8.00 56.00
52 2 8.00 44.00
5J 1 4 O0 '-' O0
54 5 20.00 68.00
55 2 8.00 76.00
56 0 0.00 76.00
57 0 0.00 76.00
58 2 8.00 84.00
o. 1 4 OlD ~:U.O0
40 0 0. O0 c,o'-"-'. O0
4-1 1 4.00 92. O0
42 1 4.C)0 96.00
45 0 O. 00 96. O0
44 0 O. O0 96. O0
45 1 4.00 100.00
4~ 0 0.00 100.00
47 0 0.00 100.00
48 0 0.00 100.00
49 0 0.00 100.00
50 0 0.00 100.00
51 0 0.00 100.00
52 0 0.00 100.00
53 0 0.00 100.00
54 0 0.00 100.00
55 0 0.00 100.00
56 0 0.00 100.00
57 0 0.00 100.00
58 C) 0.00 lO0.OC)
.... 0 0.00 100 O0
60 0 0.00 100.00
E,]. 0 0.00 100.00
62 0 O. O0 100. O0
63 0 O. O0 100. O0
64 0 O. Or? 100. O0
65 C) 0.00 100.00
SPEED
CURVE
9.0% ,
S0% ,
70,% ,
5 0.",.' ,
4-02; ,
10.~
02;
0 10 20
50 40 50
SPEED (MPH)
60 70
· SPOT :SPEED STUDY'ANALYSIS
' FOR THE CITY OF DUBLIN ':i' -' ',
LOCATION STAGECOACH RD.s/O S.TOPAZ CIR. DEVELOPHENT RESIDENTIAL
DIRECTION
DAY OF THE WEEK
DATE
TIME OF THE DAY
POSTED SPEED LIMIT
VEHICLES OBSERVED
SOUTHBOUND 50th PERCENTILE SPEED 52
MONDAY 85th PERCENTILE SPEED 57
01/i8/88 iO MPH PACE SPEED 28 TO 57
10:55-10:55 AM PERCENT IN PACE SPEED 84
25 RANGE OF SPEEDS 22 TO 51
26 SKEWNESS INDEX 1.O8
SPEED NUM-
22
24 0
25 0
26, 1
27 0
2g 4
29 1
3O 1
31 1
32 4
~4 · 1
~5 1
S6, 0
~7
40 0
41 0
42 0
4~ 0
44 0
45
46 0
47 0
4~: 0
49 0
50 0
51
55 0
54 0
55 0
56 0
5C: 0
59 0
60 0
61 0
CUMULATIVE SPEED CURVE
PERCNT. CUMULL
0. O0 5.85
0. O0 5 _ 85
0. O0 ~. 85
5.E:5 7. e,~
0.00 7. "~
15. c-;',=-: 23.
5 '-'= o' 92
. oO ._12,.
5.85 30.77
15 ='=' 50. O0
11.54 61.54
J. E:5 65.
5. E:5 6,9.23
0 O0 ~'= '"~
23.0E: 92.31
0. O0 92.31
J. E:5 96.15
0. O0 96.15
0. O0 96.15
0. O0 96,. 15
0.00 96.15
0. O0 96.15
0. O0 96.15
O. O0 96.15
O. OO 9&. 15
[). O0 96,. 15
O. O0 96.15
0. O0 96.15
.c',o 100.00
O. OO 100. O0
O. O0 100. O0
0. O0 100. O0
0 . O0 1 O0 . O0
0 . OO l O0 . O0
O. O0 1 O0. O0
O. O0 100.00
O. O0 100. O0
O.OO 100.OO
0. O0 100. O0
0. O0 100. O0
80% ,
70% ,
601 ,
40% ,
50% ,
0 i0 20
50 40 50 60 70
SPEED (MPH)
SPOT SPEED STUDY ANALYSIS
FOR THE CITY OF DUBLIN
LOCATION
DIRECTION
DAY OF THE WEEK
DATE
TIME OF THE DAY
POSTED SPEED LIMIT
VEHICLES OBSERVED
STAGECOACH RD.N/O S.TOPAZ CIR. DEVELOPMENT
NORTHBOUND
MONDAY
01/18/8S
11:10-11:30 AM
55
25
50th PERCENTILE SPEED
85th PERCENTILE SPEED
10 MPH PACE SPEED
PERCENT IN PACE SPEED
RANGE OF SPEEDS
SKEWNESS INDEX
RESIDENTIAL
`55
`59
`50 TO `59
22 TO 46
1.29
SPEED NUM-
22 i 4. O0
2.5 0 0.00
24 0 0.00
25 0 0.00
26 0 0.00
27 0 0.00
28 0 0.00
29 0 0. O0
.50 1 4.00
31 0 0.00
52 1 4. O0
33 4 16.00
34 `5 12.00
35 5 20.00
56 2 8. O0
8.
57 2 O0
~.-,
~b, 2 8. O0
.:. o.0[
`59 '" '-' ]
40 0 0.00
41 0 0.00
42 0 0.00
43 0 0.00
44 1 4. O0
45 0 0.00
46 1 4.00
47 0 0.00
4:3 0 0. O0
49 0 0. O0
50 0 0.00
51 0 0. O0
5,:. 0 0 O0
53 0 0.00
54 0 0.00
55 0 0.00
'CUMULATIVE SPEED CURVE
PE RCNT. CUMUL.
4.00
4.00 :
4.00
4.00 90% ,
4.00
4.00
4.00
4.00 SOX ,
8.00
8.00
12.00
28.00 70~ ,
40.00
60.00
6E:.C)O
76.00 60% ,
84.00
92.00
92.00
92.00 SOX ,
92.00
92.00
96.00
96.00 40~ ,
100.00
100.00
100.00
100.00 30% ,
100.00
lO0.C)O
100.00
ioo.oo 20% ,
lOO.OO
100.00
Sd;, 0 0. O0 1 O0. O0
57 0 0.00 100.00
58 0 0.00 100.00
59 0 0.00 100.00
60 0 0.00 100.00'
E, 1 0 C). 00 100. O0
62 0 0.00 100.00
30 40 50
SPEED (MPH)
60 70
SPOT SPEED STUDY ANALYSIS ~. -' ..
"FOR THE CITY OF DUBLIN ....
LOCATION STAGECOACH RD.N/O S.TOPAZ CIR. DEVELOPMENT RESIDENTIAL
DIRECTION
DAY OF THE WEEK
DATE
TIME OF THE DAY
POSTED SPEED LIMIT
VEHICLES OBSERVE[)
SOUTHBOUND 50th PERCENTILE SPEED 35
MONDAY 85th PERCENTILE SPEED 41
01/18/88 10 MPH PACE SPEED 50 TO 59
11:10-11:50 AM PERCENT IN PACE SPEED 76
55 RANGE OF SPEEDS 27 TO 45
25 SKEWNESS INDEX 1.17
SPEED NUM-
27 1 4.00
2E: 0 0. O0
29 0 0.00
50 2 8.00
31 1 4.00
52 1 4. O0
.53 1 4_00
54 5 20. O0
55 2 8. O0
56 J 12.00
57 '~ 8.00
5b'-: 0 0.00
59 o 8 O0
40 1 4.00
41 o E:. 00
42 1 4. O0
45 0 0.00
44 0 0.00
45 1 4.00
46 0 0 _ OL]
47 0 0.00
4E: 0 0. O0
49 0 0. O0
50 0 0.00
51 0 O. O0
52 0 0.00
53 0 0.00
54 0 0.00
55 0 0.00
56 0 0.00
57 0 0.00
SE: 0 O. 00
59 0 O. O0
60 0 0.00
6 ]. 0 0.00
~,.-. 0 0. O0
,, e',3 0 O. 00
64 0 0.00
65 0 0.00
66 0 0. O0
~;7 0 0. O0
CUMULATIVE SPEED CURVE
PERCNT. CUMUL.
4.00
4.00
4.00
12.00
16.00
20.00
24.00
44.00
52.00
64.C)0
72.00
72. C)0
80. O0
84. O0
92.00
96.00
96.00
96.00
100.00
i00.00
100.00
100.00
100.00
100.00
100.00
1oo.oo
100.00
100.00
lO0.OO
100.00
1 O0.00
i O0. O0
100. OC)
100.00
100.00
100.00
100.00
100.00
100.00
100.00
100.00
90% ,
80% ,
70% ,
60% ,
50% ,
40% ,
50% ,
0%
!
0 0 20 30 40 50
SPEED (MF'H)
60 70
MEMORANDUM
RECEIVED
FEB 1989
PUBLIC WORKS
DATE:
TO:
FROM:
SUBJECT:
February 2, 1989
Lee Thompson
Michelle DeRo.bertis
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 Siagecoach 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, I988,
were 39 mph and 41 mph north of Turquoise Street (for northbound and
southbound traffic, respectively) and 39 mph and 37 mph south o£ 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 or' 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. Thc 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 945&~ · (415) 463-0611
PLEASANTON · SACRAMENTO. FRESNO. CO,NCCRO
tee Thom-son ;:' ' ~ ,' ' ~ '- -2- ~:'~'~ ~- · ~ ~_ .~ February 2, 1989
Given the collector road function of the roadw~, the ty~e of frontage, and the
results of the speed survey (i.e the 85th ~ercentile s~eeds are 35 m~h and 37 m~h),
it is recommended that the s~eed limit be raised from ~5 mvh to 30 m~h ~outh of
Turquoise Street. North of Turquoise Street, the latest ~eed ~urvey revealed that
the 85th vercentile s~eed has been lowered. Because of this fact and by
considering the benefits of having a single uniform ~eed limit on Stagecoach
Road, we also recommend that the s~eed limit north of Turqouise Street be
reduced from 35 mvh to 30 m~h.
In the existing 25 mph section south of Turquoise Street, 100 pereent 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 .~peed 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
157-001M.gMD