HomeMy WebLinkAboutNB 7 4-WAY STOP SIGN 08-17-81 No. 7
~ 8-17-81
DATE: K]~'OST Inter-Corn
TO:
FROM:
SUBJECT:
CHARLES THAYER, INTERIM CITY MANAGER
NO~%N HOWER, TRAFFIC ~GINEER
INVESTIGATICN FOR 4-WAY STOP AT SYCAMDRE AVENUE AND CARFAX AV~73E
~TI~:
The intersection of Sycamore Avenue and Carfax Avenue does not m~et the standard
warrants for 4-way step installations and it is recommended that stop controls on
Sycamore Avenue not be installed.
It is reuf~m,ended that the intersection be studied for school crossing guard type
of control when school is in session.
BACKGR[~:
Sycamore Avenue is presently classed as a secondary arterial, although it is
presently developed in this area to a 40' pav~d width. Carfax Avenue has a paved
width of 36'. The development in the area is presently residential with multiple
family dwellings on the north side of Sycamore and single family on the south.
There are elementary schools on both sides of Sycamore to the east and there is a
school crosswalk at the east side of the intersection. At present, Carfax is
stopped at Sycamore.
A proposal has been made to stop Sycamore Avenue at Carfax Avenue, which will
create a 4-way stop intersection.
ANALYSIS:
A traffic study of the intersection has indicated, on the basis of accidents and
vehicle volumes, that the intersection cannot m~et the warrants for 4-way stop
control. This intersection was annexed into the City on Dec. 26, 1980 and since
that tim~ Engineering records indicate there have been three accidents, none of
which would have been corrected by 4-way stop control.
Visibility 6f the intersection is good with no unusual obstacles and no accidents
that would indicate a visibility problem.
Vehicular volumes alone do not warrant 4-way stup control during any hour of the
day. The addition of the school pedestrian may warrant it during two hours of the
day on school days. The intersection should be studied for a school crossing
guard when the schools are in session.
It should be noted that a stop installation on Sycamore Avenue will increase noise
in the area and probably increase rear end type of accidents.
db
NOrM HOWER
TRAFFIC ~GINEER
INTERSECTION VOLUMES
SIXTH STREET AND "B" STREET
SYCAMORE CARFAX
EAST WEST NORTH SOUTH INTERSECTION
TIME BOUND BOUND TOTAL BOUND BOUND TOTAL TOTAL
12:00- 1:00 AM 41 38 79 4 5 9 88
1:00- 2:00 25 20 45 9 6 15 60
2:00- 3:00 13 6 19 5 2 7 26
3:00- 4:00 8 5 13 1 2 3 16
4:00- 5:00 11 6 17 2 1 3 20
5:00- 6:00 83 28 111 8 7 15 126
6:00- 7:00 398 120 518 35 29 64 582
7:00- 8:00 633 284 917 28 37 65 982
8:00- 9:00 304 272 576 34 20 54 630
9:00-10:00 164 220 384 24 25 49 433
10:00-11:00 160 198 358 16 27 43 401
11:00-12:00 PM 224 248 472 18 21 39 511
12:00- 1:00 294 301 595 23 30 53 648
1:00- 2:00 263 243 506 24 17 41 547
2:00- 3:00 218 340 558 28 18 46 604
3:00- 4:00 232 517 749 25 38 63 812
4:00- 5:00 250 634 884 24 30 54 938
5:00- 6:00 295 571 866 28 25 53 919
6:00- 7:00 219 260 479 30 30 60 539
7:00- 8:00 174 182 356 39 29 68 424
8:00- 9:00 156 119 275 31 25 56 331
9:00-10:00 107 94 201 24 7 31 232
10:00-11:00 74 75 149 15 15 30 179
11:00-12:00 65 59 124 14 8 22 146
TOTALS 4,411 4,840 9,251 489 454 943 10,194
This intersection does not meet the volume warrants for four-way stop
control during any hour of the day.
COLLISION DIAGRAM
CITY OF TUSTIN
_ LEGEND-SYMBOLS
Moving vehicle
Backing Vehicle
-- Out of Control
Parked Vehicle
Pedestrian
-- Fixed Object
Non-Injury
Injury
_ Fatal
Daylight
Dark ~
LOCAT ! ON:
TYPE
Right Angle
Rear End
Left Turn
Sideswipe
Pedestrman
Other
N
ACCIDENT SUMMARY
DAY NIGHT TOTAL
Fatal Inj. P.D. Fatal Inj. P.D. Fatal Inj. P.D.
STANDARD WARRANTS FOR 4-WAY STOP CONTROL
IN USE BY: U.S. Depar%ment of Transportation
State of California
Any of the following conditions may warrant a four-way stop sign
installation:
o
Where traffic signals are warranted and the need is
urgent, the four-way stop can be used as an interim
measure until a traffic signal can be installed.
An accident problem, as indicated by five or more reported
accidents of a type susceptible of correction by a four-way
stop installation in a 12-month period. Types of accidents
susceptible of correction include right angle and left
turn collisions.
3. Minimum volume warrant:
so
The total vehicular volume entering the intersection
from all approaches must average at least 500 vehicles
per hour for any eight hours of an average day, and
The combined vehicular and pedestrian volume from
the minor street or highway must average at least
200 units per hour for the same eight hours with an
average delay to minor street vehicular traffic of
at least 30 seconds per vehicle during the maximum
hour.
c. When the 85-percentile approach speed of the major
street traffic exceeds 40 miles per hour, the
minimum vehicular volume warrant is 70 percent of
the above requirements.
At a "T" intersection (3-way) a minimum vehicular volume of 75 percent
may be used. (Total vehicular volume of 375, minor street volume of'
150.)