Item 3 - Warrants for Traffic Control DevicesI
Agenda Report
Warrants for Traffic Control Devices amok
February 13, 1986
Page 2
Federal and State standards for the installation of stop signsr
yield signs, and. traffic signals are: in general, based upon
measurements of existing traffic° flow conditions and whether
these measurements meet or exceed certain predefined levels. The
traffic characteristics on which the: standards: are based include
the. following.
o vehicular volumes
o pedestrian volumes
o speeds
o delay.
o accident history
Additionally,. signs may be warrantedon the basis of the: classi-
fcation of the main road as a major street, or. because of
r'estricted sight distances: on the side street. The warrants for
stop and yield signs and for- traffic signals, as adoptedand
utilized by Caltrans, are included in this report tAttachment 11.
These are the standards which are used by all local agencies
within the State unless the agencieshave developed and adopted
their own.
The warrantsfor traffic signals which apAear in the Caltrans :4~`
manual are the same: as those established by the FHWA. On January
ll. 1986, however, three additional Federal warrants went -into
effect. These new warrants were developed out of the recogni.-
tion that the: existing warrants were too restrictive and did not.
address the-: special needs of many smaller communiti.es..- It is
anticipated that.many locations which previously did not meet
warrants for the Installation of a traffic signal can now be
signalized under the new guidelines.,
The warrants for traffic signals are more definitive and precise
than those for the installation of signs. The guidelines for the
installation of signs are: based to a larger extent on engineering
judgment than on numerical. values.Traffic engineers are admon—
ished in. the manuals however to exercise: restraint in. the instal-
lation of restrictive signage lest obedience diminish as a result
of too many signs and too; little enforcement.
Agenda Report
Warrants for Traffic Control Devices
y February 13, 1986
}
Page 3
z
The California communities which have adopted their own warrants
for signs. (.stop and yield) have tended to define less restrictive
conditions in terms of the volume levels necessary to satisfy
the warrants:. one -example is the City of Coronado where the City
Engineer has recommended to Council,, and the. City has adopted, a
series of very specific,. although somewhat lens restrictive,
warrants for the installation of stop and yield signs.
By being very specific in the. definition of the traffic con-
ditions which warrant the: installation of traffic control
devices, a City Council limits the ability of its staff to apply
engineering and/or discretionary judgment to these decisions.; In,
the: case of Coronado, (Attachment 2) the local warrants precisely
define the volume levels and. other' conditions of the warrants, so
precisely in fact that room.for engineering judgmentis virtually
eliminated from these decisions;,;
The question: of a local: government°s liability arises from the
use of warrants which are not the accepted standard..
In order to minimize
the risk of liability claims against the
local municipality in the application.of warrants other than
those:: specified by State and Federal Manuals, sound. rational must
support and justify the: use of: alternative. warrants. The
development andapplication of less restrictive warrants must be-
founded
efounded on engineering research specific to the locality and the
traffic conditions. to which they are to be applied
Alternative warrants should be.in basic conformance: with Federal
and State standards and deviations should be supported with docu-
mented research. The alternative warrants should define a base
minimum standard. It is this base minimun that needs to be
justified with supporting studies: and findings performed by
qualified engineers.
The factors that should be taken into consideration when con-
templating the development of alternative and less restrictive
warrants, for the installaton of traffic control. devices include
the followings.
o alternative warrants must be in substantial
conformance with Federal. and State manuals
o they mustbesupported and documented by sound
engineering research
o minimum standards for each warrant should be defined
FEB 131986 ITEM
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Agenda Report
Warrants: for Traffic Control Devices
February 13, 19B6
Page 4
o warrants which define minimum standards too precisely,
limit the flexibility of their application -and the use
of engineering judgment
o excessive use of restrictive signage (which can result'
from the application of less restrictive warrants), leads
to reduced -respect for and obedience of the signs.
Regarding the question of developing alternative warrants for
signals as well as signs, the new Federal warrants for signals
should satisfy most existing demands for signals without the
need for local agencies to develop their own warrants..
FINDINGS
The Federal Highway Administration and Caltrans warrants have
been established, based upon well proven engineering standards'.;
However, the warrants are only guidelines for the establishment
of traffic control measures . Deviations from the guidelines
f can be made based upon specific conditions that may exist at
a given intersection such as
1. approach speeds exceeding posted speed limits
2. One or more of the approaches to the intersection:
that. do not meet City street design standards..
3. Inadequate: provisions for pedestrian traffic
at or approaching -the intersection.
4. The street being stopped is, not a mayor circulation
element. roadway.
RECOMMENDATION
It is recommended that the City Council approve the attached
resolution, Attachment 3,; adopting the Caltrans Traffic Manual
Warrants, Attachment 1, and the following special findings that
must. be made in order- to establish a. four-way stop in. residential
areas
1. The approach speeds for one or more legs of the
intersection exceed the posted speed limit.
2 One or more of the approaches to the: intersection
do not meet City street design standards.
t
{
FEB 1980-1 t T E M: 3
i
4 o,f 20
Agenda Report
Warrants for. Traffic. Control Devices
February 13, 1986
Page 5
. There are inadequate provision for pedestrian traffic
at or approaching the intersection..
The street(s) being stopped is not designated as a
secondary, major, or primary arterial in the City's
adopted circulation element.
JLB:ADA :pw
Attachments (3)
5 of 20
FEB 13 1986 ITEM
3
"t
Traffic ManualTRAFFIC SIGNALS AND LIGHTING; 9-1
12-1979
CHAPTER
9'
TRAFFIC SIGNALS
AND LIGHTING
Traffic Signals -Basic: Information and Warrants 9-01:
,.--•.,
9-01.1 Introduction
When the 85 -percentile speed of major street traf-
Traffic signals are electrically powered traffic con-
fie exceeds 40 miles per hour,, or when the intersec-
trol-devices which: alternately direct traffic to stop
- tion lies within the built-up area, of an isolatedcom
and: proceed at highway andstreet intersections..
munity having a population less than 10,000, the
Their purpose: is the orderly assignment of right of
location is; considered rural. All other areas are con -
way to the various traffic movements.
sidered urban. Since the installation of traffic signals
When justified and properly designed a traffic sig-
may increase certain types of collisions, the decision
"
nal. installation may achieve one or .more: of the fol-
to install signals should not be based solely upon war-
lowing:
rants. Consideration should also be given to such fac-
frequency types of acci-
tors as delay, congestion,. approach conditions, driver
confusion and additional evidence of need for right:
dents; especially the right-angle type;
of way assignment above that which could. be pro -
2. Effect orderly traffic movement;
vided by stop signs.
3. By proper, coordination, the continuous' flow of
The installation of traffic signals should: be consids
.,
a platoon of traffic at a definite speed along a
eyed if one or more of the warrants listed. below are
given route;
met: _
`i
4. Allow other vehicles and pedestrians to cross a
Warrant 1- Minimum Vehicular Volume..
heavy traffic stream; and
Warrant 2- Interruption of Continuous Traffic: 1
5. Control traffic more economically than by man-
Warrant 3 - Minimum. Pedestrian Volume.
ual methods.
Warrant 4 -School Crossings:
Unjustified, ill -designed, improperly -operated, or
Warrant S - Progressive Movement.
poorly maintained traffic signals may cause:
Warrant fi -Accident Experience..
1. Increased accident frequency,
Warrant. 7 - Systems.
2. Excessive delay,..
: .
Warrant 8 -Combinationof Warrants:
3.. Disregard of signal indications, and
4. Circuitous travel by alternate routes.:
9-01.3 Warrant 1-1Minimum Vehicular Volume
Contrary to common belief, traffic signals do not
The minimum vehicular volumewarrant is intend-
always increase safety and reduce delay. Experience
ed for application where the volume of intersecting
shows that the number of right-angle collisions may
traffic is the principal reason for consideration of sig
decrease after the installation of signals,: but the num-
nal.. installation.. The warrant is satisfied. when for
her of rear -end.. collisions will. increase in: many in-
each. of any 8' hours: of an average day the traffic
volumes given. in the table: below exist- on the major.
stances..: The installation. of signals may increase over-
all and. reduce intersection capacity.:
street and. on .the higher -volume: minor street ap-
.delay
Consequently, it is of the utmost importance that the
proach t0 the intersection.
-..•
consideration of a signal installation and the selection
of equipment be preceded by a. thorough study of
Number of lanes for Vehicles per Vehicles per
moving traffic, on hour on major houron higher -
traffic and roadway conditions made by an engineer
each approach street (total volume minor -
experienced and trained in. this field. Equally impor-
of both street approach
Cone direction approaches}
tant is the need for checking the efficiency of a. traffic,
only?
signal in operation. This determines the degree to
which the type of installation and the timing pro-
(Minimum Requirements)
-"
gram meets: the requirements of traffic.
M'a;o� Minor Street Urban Rural. Urban Rural
9-01.2Warrants
1 - - - - - - - _ . - . - 500 350 ISO 105
2 or more -- 1 - 600 420 150 105
The warrants for the installation of traffic signals
g
2 or more -- 2 or more -- 00 420 200 140
1. - - - - - -- 2 or more. -- 5 500' 350 200 140
are based on those stated in the Manual on Uniform
Traffic Control. Devices. These warrants apply to
both pre -timed and traffic -actuated traffic signals.
FE B 13 1980 ITEM,3
:,.
6- o f 20 �y`,
N
FEB 131980 ITEM 3
of 20'
,z.
4-22 SIGNS TRAFFIC MANUAL
April 1975
4-03.3 Design, Policy and Location for Individual Signs
R1
Publicity through the radio and press is highly de-
sirable when STOP, signs are installed and. especially.
LNWhite on ped
30' octagon
when it is necessary to change their location.
10' SeeleSL a letters
Any of the following conditions may warrant a
"
(Also: available in
_ four-way stop sign installation:.
24', 36W' and 48' sizes)
L. Where traffic signals are warranted and the
need is urgent, the four-way stop is an, interim
measure that can be installed quickly to control
traffic while arrangements are being made for
the signal installation.:
2. An accident problem,, as indicated by five or
Policy: The RT sign shall be used on public roads
more reported accidents of a type susceptible of
where a stop is required.. Stop signs shall be erected
correction by a four-way stop installation in a
on both the left and right side of one-way roadways
12 -month period. Types of accidents susceptible
which are 30 feet or more: in width.. Stop signs shall
of correction include right angle and left turn
not be installed at signalized intersections.
Conditions" warranting STOP signs are:
collisions.
3. Minimum volume warrant:
{ {
1. On the" less important road at its intersection
a. The total vehicular, volume entering the in-
with. a main road where application of the nor -
Mal right of way rule is unduly, hazardous as
at least 500 vehicles per hour for any eight
evidenced by accidents susceptible of correc-
hours of an average day, and
b. The combined vehicular and pedestrian vol -
tion by STOP signs.
2 On a county road .or city street at its intersec-
urne from the minor street or highway must
average at least 200 units per hour for the
tions with a state highway.
�-� 3.. At the intersection of two main highways. The
same eight hours with an average delay to
highway traffic to be stopped depends on ap-
minor street vehicular- traffic. of at least 30
seconds per vehicle during the maximum
proach speeds, volumes,. and turning move -
hour.
menu
n a street enterin ale all established
4. O g legally
er
c- When the 85' -percentile approach speed of
major street traffic exceeds 40 miles per
through highway street..the
5. On. a minor, street where the safe approach
hour, the minimum vehicular volume war -
speed to theintersection is less than. 10 miles per
rant is 70 percent of the, above requirements.
.;
hour..
A. four-way stop sign installation is a useful traffic
A STOP sign is nota "cure-all" and is not a subst
control measure when other available means of con-
control
trol are not adequate. It should. not be used unless the
for other traffic control devices. Many tunes the
need for a STOP" sign can be� eliminated if the sight
volume of traffic. on the, intersecting roads is about
distance is increased" by removing obstructions.
equal and is undesirable at low-volume intersections.
When STOP signs are" placed- on all enteringlegs
The installation of STOP signs at locations where
they are unexpected or where approach speeds are
of an intersection, each STOP sign may be supple -
F
high should be avoided if possible because they may
mented by a separate: plate mounted. below it with
a message "3 -WAY", "4 -WAY", etc. The supple-
increase accidents. However, if there is no alteMa-
mental late shall have white letters on a red back -
p
five to a. STOP sign, then an advance Code W17
ground.
S'T'OP AHEAD,sign and appropriate: pavement
markings should be placed in conjunction with. it,
LionErect in the standard- position. on the
. ocat
'
. right or Left at or near the entranceto an intersection.
-
or at any location necessary to controltraffic within
an intersection.
FEB 131980 ITEM 3
of 20'
Policy: The R39 sign may be used at the entrance
R34
to an intersection where it is- desirable to assign the
STOP sign is unduly
'a
right of way but where the ,
Red; an white
restrictive Such:signs shall not be erected upon e
YIELD'
. W x 36
3' series: C letters
in'
roaches to more than one of the intersecting
approaches
streets,: nor shall they be placed where sight distance
(Also avaiinbie
- ,8. x. A8", st:e)
is so limited a near stop is necessary before entering: 1
the intersection. Traffic volumes on the approaches
I
be used must be less than. the
where this: sign is to. _ .
volumes on the two most ` heavily traveled
approaches to the intersection. ;
Conditions warranting Yield. signs:
1. 4n a minor road at the entrance to an intersec-
ntersection.
tionwhere it is necessary to assign right of way to the
:-
major road, but where: a stop is not necessary at all
times.
2. Where: there is a separate or channelized right= 1,
turn lane: without an adequate acceleration lane. -'
a
3. At. any intersection where special, roblezn: ex
P P
fists and an. engineering study indicates the, problem
-
to be susceptible to correction by use of Yield signs
-.
�,•
Location: Erect in the standard position on the
right or left at the, entrance to intersections or.
highways.
FEB 13 398- ITEM 3
8 Of 20.
y
CITY OF CORONAD
111 8AVENUE DEPARTMENT OF PUBLIC WORKS
-
CORONADO. CA. 9211'6' [7141:435-41:64
OFFICE OF THE CITY ENGINEER
TRAFFIC CONTROL WARRANTS
f
I. General ;
Traffic control devices are all signs, signals, markings (including
striping and: curb colors} and similar standardized installations placed
on or adjacent to a street or highway by authority of':a public body or
official having jurisdiction to regulate, warn or guide traffic Basic
information.regarding such devices is availablein various: official
publications, particularly the Manual on Uniform Traffic Control. Devices
i published by the U..S. Department of Transportation and the. State Depart-
ment of Transportation's Traffic Manual. The California Vehicle Code
relies upon the presence of traffic control devices for the correct
handling of vehicle and pedestrian traffic..
j II Policy_
. Regulatory traffic control devices are to be installed at a partic
ular location only after an engineering study of the site to determine
the nature of the problem believed to exist and the degree of control
that will solve or mitigate the difficulty. This study will be guided.
_ by the criteria warranting: the installation of the various traffic control
devices established by this document.
;. III. Traffic Committee: Approval
The City's Traffic Committee, established by the Municipal Code, has
approved the individual warrants applicable to the various, traffic control
devices asa. guide to insure consistency in its recommendations to the
City Council regarding such measures...
IV. Warra nts
The a accompanying warrants outline the criteria which should governthe
decisions toinstall. specific trafficcontrol devices of a: re gulatory
nature.
..nwood. C'a Newton., P.E.
City -Engineer--.
r
FEB 1 3 1980 ITEM
3
9 of 20
c-,
APPENDIX A
Two -Way Stop Control
APPENDIX B
Three -Way & Four -Way Stop Control
APPENDIX C
Yield Control
APPENDIX D
Traffic Signals
APPENDIX E
Marked -Pedestrian. Crosbwalks-
APPENDIX F
Adult Crossing Guard
APPENDIX G
Red. Curb Clearances
APPENDIX.H
White Curb Zones
APPENDIX I
Yellow Curb Zones
APPENDIX a
Green Curb ,Zones
APPENDIX K
Blue Curb Zoned
APPENDIX Ll
Angle Parking Zones
APPENDIX M
Through Streets
3198 ITEM:
a
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of 201
vi
s v.
s
11 of 20
CORONADO, CALIFORNIA
OFFICE OF THE CITY ENGINEER
WARRANTS',
TWO-WAY STOP CONTROL
AT STREET INTERSECTIONS
Stop -signs are used to control right of way assignment at an inter-
section. Two -Way stops provide free flow on the principal street.
Through. Street.
Stop signs are warranted on the minor streetapproaches to an inter-
section when the principal street is a State Highway or a designated
through street.
2... Other Than a Through Street --Two Warrants
Stop signs are warranted on the minor street if any two of the
following conditions exist:
a. Volume
(1) Total vehicular volume on the principal street is 500 vehicles
per day or 50 vehicles per hour during the peak hour of an average;
days. and
(2) Total vehicular volumes on the minor street is 250 vehicles Per
day or 25 vehicles per hour during the peak hour onan average day
or there are 25 pedestrians crossing the minor street during the
peak hour.
b. Accident
Three or more types of accidents susceptible of correction by stop
signs within, a 12 month. period.
FEB 13' 1986 ITEM 3
APPENDIX .A
I2of .2.0 FEB 3 1980 ITEM
13 of 20
CORONADO,.. CALIFORNIA
OFFICE. OF THE CITY ENGINEER
WARRANTS
FOUR-WAY & THREE-WAY STOP CONTROL
AT STREET'TNTERSECTIONS
Stop signs are- used to control right of way assignment at an inter-
section. Three -Way and Four -Way stops do not give priority to either
street.;
1. Signals Warranted
Stop signs are warranted at any street intersection which meets
warrants for signaization where the need for immediate action is urgent.
Such signs are considered an interim measure pending the installation of
traffic signals
. Where Signals Are Not Warranted
Stop signs are warranted at street intersections where any of the
following conditions exist:
a. Volume
(1) Total vehicular volume entering the intersection from all
approaches averages 300 vehicles per hour for any 8 hours of an
average day;: and
(2)
The vehicular volume entering the intersection from the minor
street for the same 8 hours averages at least one-third .of the
total volume entering the intersection.
(3) Where significant pedestrian traffic is involved, intersection
volumes may be computed as a combination of vehicles and pedestrians.
b. Accident
Six or more types of accidentssusceptible of correction by stop
APPENDIX S
FEB 13 1980 ITEM
signs within a 12 -month period.
c. Visibility
Sight distance (straightline) on at least one of the approaches
of the principal street for vehicles or pedestrians crossing the
intersection is less than 160 feet.
Special Conditions for Residential Areas
In residential areas the minimum volume
may be reduced tosixty percent (60%) of the stated values provided all:
of the following conditions obtain:
Both streets have residential
per hour speed limits.
Neither street is a designated "through" street.
Neither street exceeds 48 feet of curb to curb roadway width.
No existing stop sign or signal, is located on the principal
street withina distance of 800 feet..
e. Streets from at least three legs extend_800
from the. intersection.
Installationof a four-way or three-way stop
overall traffic circulation requirements for the area.
Approved. by Traffic Committee August 22, 1979.
FEB 1 31986 ITEM
CORONADO, CALIFORNIA
OFFICE OF THE CITY ENGINEER
WARRANTS
YIELD 'CONTROL
AT STREET INTERSECTIONS
Yield signs are usedto control right of way assignment at inter-
sections where Two -Way Stop signs are considered unduly restrictive, but
some such control is advisable.
1.: Two -Way Stop Not Warranted
Yield signs are warranted at those intersections which do not qualify
for two-way stop signs,but where the conditions are suchthat the criteria
for stop control is 75 percent satisfied.
2. Special Conditions
Yield: signs may be warranted where special conditions exist atan
intersection which makes it desirable to indicate whichstreet has
right of way preference. Oblique angle intersections and dip street
sections are examples; but engineering judgment is the primary factor
in determining such locations..
Linwood. C. Newton, P.E.
City Engineer
Approvedby the Traffic Committee August 22.; 1979.
APPENDIX C
1.5 of 20 FEB 13 1980 ITEM
r 1.
CORONADO.,, CALIFORNIA
OFFICE: OF THE CITY ENGINEER
WARRANTS' -
TRAFFIC: SIGNALS;
-
Traffic signals are the most effective method of controlling right of
i
3
way assignment at an.ntersection.
T. Traffic: signals are warranted at an intersection when any one. of the
following criteria is.met
a. Vehicular Volume:
(11 Total. vehicular volume on the principal, street is 500 vehicles:
per hour for each of any 8 hoursof an average day; and
(2) Vehicular' volume on the minor street in one direction during
'
the same. 81 hour ,period is 150 vehicles: per hour.
b. Interruption of Continuous Traffic
(1) Total vehicular volume: on the principal street is 750 vehicles
per hour for each of any 8 hours:of -an average day;:: and.
(2) Vehicular volume on the minor street in one direction during
the same 8,hour period is 75 vehicles per hour.
c.: Pedestrian Volume
i
(1) Total vehicular volume on the principal street is 600 vehicles
per hour for each of any 8 ;hours of an. average day; and
(2) •Pedestrians on the highest volume crosswalk on the principal
street during the same 8 hour period amount to, 150 per hour'.
d._ School Crossing
3
('1) Na controlled crossing available within 600.feet of the
APPENDIX D
16 of. 20 FEB 13 1980: ITEM
- AP
^tet
intersection; and
(2) Vehicular volumes of 500 and school age pedestrian.volumes of
100 for each of any two hours daily while children are crossing to-
'y
and from school; or
(3)Vehicular volumes of 500 per hour for each. of: any two hours
while children are crossing to and from school and a.minimum of
s
500 school age pedestrians- during the entire day.
r
e. Progressive: Movement
y
When one of the following is true:,
(1) 0n an isolated one. -way street or on a street which preponder-
antly has unidirectional traffic significance, adjacent signals are
so far apart that the necessary degree of platooning and. speed
control of vehicles. would otherwise be,lost..
O On a.,two-way street, where adjacent signals do not provide the
}
necessary degree -of platooning and: speed control and the proposed:
i
and adjacent signals couldconstitute a progressive signal system.
f .. Accident
(1). Adequate trial of less restrictive remedies with satisfactory
i
observance and enforcement has failed to reduce.the accident
frequency; and
(2) Five or more reported accidents of types susceptible of
correction, by traffic signal control have: occurred within a
F
12 -month period, and
(3) There exists a volume: of vehicular and pedestrian traffic not
less than 80 percent of the requirements specified in the minimum
f
D
3
17 of 20
FES 1311980'" 1 T E
Vehicular Volume warrant, the Interruption of Continuous Traffic
warrant, or the Pedestrian Volume warrant; and
(4) The signal installation will not seriously disrupt progressive
traffic flow.
g. Systems
Applied when a traffic signal is needed to encourage concentration
and organization of traffic flow networks based upon the criteria,
that two or more major routes have a total existing, or immediately,
projected, entering volume of at. least 800 vehicles during the peak
hour of a typical weekday, or each of any five hours of a Saturday
and/or Sunday.
2. In exceptional circumstances traffic: signals may be justified where no
single warrant is satisfied, but where any two of the warrants for Vehicular
Volume, Interruptions to Continuous Traffic and Pedestrian Volume are
satisfied to the extent. of 80 percent or more of the stated numerical values
for each. of any 8 hours of an average day.
Linwood C. Newton, P.E.
City Engineer
Approved by Traffic Committee August 22, 1979..
18 of 20
FEB 1.3 1986 ITEM
RESOLUTION NO.
lot•
A RESOLUTION OF THE CITY COUNCIL OF THE
CITY OF POWAY, CALIFORNIA ADOPTING THAT PORTION
OF CALTRANS` TRAFFIC MANUAL AND ESTABLISHING STANDARDS
FOR AN 'BALL WAY"- STOP INTERSECTION- IN
RESIDENTIAL AREAS.
WHEREAS, in order to aid municipal agencies to define the
need for traf f .c.` control devices and
justify •ins allaton
z:
warrants have been established by responsible Federal, and
State. -agencies
-WHEREAS, warrants are the criteria by which need is measured.
and. defined in terms of vehicular and pedestrian traffic volumes.
tl
WHEREAS,, warrants have. been developed" to serve as guidelines ?�
for the.. installation of traffic control devices... f'
WHEREAS, in order to establish warrants other than those: �
specified by Federal and State Manuals,_ base minimum.standards
must be. established. -
•
NOW`r THEREFORE the City Council of the City of Poway hereby
adopts that
P° portion of the Caltrans Traffic. Manual attached
hereto as Exhibit. A and establishes, the following standards
trt for an "All -Way" stop intersection in residential. areas:
1 The approach speeds for one or more legs
of the intersection exceed the posted
speed limit,
2: One or more of the approaches to the inter-
section do not meet City street design
standards
r.
3.. There are inadequate: provisions for pedestrian;
traffic at or approaching the intersection.
4 .
The street(s) being stopped is not designated
as a secondary, major.. or primary arterial in
the City's: adopted circulation element.
PASSED, ADOPTED,; and APPROVED by the: City Council of the.
City of' Poway at a regular meeting -this day of February
1986 r
Carl Kruse, MAYOR
ATTEST
t
Cie K. WahlsFen,: ity lex}c
1.9 of 20 FEB 13 1980 ITE M
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f
A-22 SIGN'S TRAFFIC MANUAL
April. 1975;
Y
443 .3. Design, Policy and Location for Individual Signs
ai
White. an Red
30' octagon
is 10' series C letters
(Also available in:
24% 36' and 48'sizes),
Policy: The R1 sign. shall be used on public roads
where. a stop is required. Stop signs shall be erected:
on both. theleft and right side: of. one-way roadways
which. are 30 feet or more in width. Stop signs shall
not be: installed at signalized intersections.
Conditions warranting STOP' signs are:
1., On the less important road at its intersection.
with a main road where application of the nor-
mal right of way rule is unduly hazardous as
evidenced by accidents, susceptible of correc-
tion by STOP signs.
2: On a county road .or city street, at. its intersec-
tions with a state highway.
3. At the intersection of two, main highways. The
highway traffic to be stopped depends on ap-
proach speeds, volumes, and turning; move-
ments.
4. On a street entering a legally established.
through highway or street.
5 On: a minor street where the safe approach
speed tothe intersection is less than10miles per
hour.
A: STOP` sign is not a "cure-all." and is not a substi-
tute: for other traffic control devices. Many, times the
need for a. STOP sign can. be eliminated: if the sight
distance is increased by removing; obstructions.
The installation of STOP signs at locations where
they are unexpected or where approach speeds are
high should be- avoided if possible because they may
increase accidents. However,. if there is no alterna-
tive to a. STOP sign, then an advance Code. WIT
STOP AHEAD. sign and appropriate pavement
markings should be: placed. in conjunction with it.
20, 0 f 20
Publicity through the radio and, press is highly de-
sirable when STOP signs are installed. and especially
when it is necessary to change their location.
Any of the following conditions may warrant a''
four-way stop sign installation:.
.1. Where traffic signals are warranted and the
need is urgent, the four-way stop is an interim
measure that can be installed quickly to control
traffic while arrangements are being made for
the signal installation.
2. 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:
a. The total' vehicular, volume entering the in-
tersection from all approaches must average
at least- 504 vehicles per hour, for any eight
hours of an. average day, and
b. The: combined vehicular and. pedestrian.` vol-
ume 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 F
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 war
rant is 70, percent of the above requirements.
A four-way stop sign installation is a useful traffic
`t
control measure when other available means of con-
trol are not adequate. It should not be used unless the
volume of traffic on the intersecting: roads is about
equal and is undesirable. at low-volume intersections.
• When STOP signs are placed on all entering legs
of an intersection,, each STOP sign may be supple-
mented by a separate plate mounted below it with
the message "3 -WAY' "4 -WAY", etc. The supple-
mental plate: shall have white letters on a. red: back--
ground.
ack--ground .
Location: Erect in the standard position on the:
right or, left at or near the entrance to an, intersection
or at any location necessary to control; traffic within
an intersection.
EXHIBIT "A.o _
FEB 13 1980' ITEM 3
L
RESOLUTION NO.
=..` A RESOLUTION OF THE. CITY COUNCIL OF THE
CITY OF POWAy, CALIFORNIA ADOPTING A PORTION OF
'= THE-CALTRANS` TRAFFIC MANUAL AND ESTABLISHING FINDINGS
FOR: THE INSTALLATION OF AN "ALL WAY" STOP
E INTERSECTION
IN -
IN RESIDENTIAL AREASWHERE' THE ADOPTED
WARRANTS ARE NOT'MET
f
i
WHEREAS, in order to aid municipal agencies to define the
need for traffic control devices and justify installation,
warrants have been established by responsible Federal and.
State agencies:.
WHEREAS, warrants are the criteria by which need is measured
and defined in terms of vehicular and pedestrian traffic volumes..
WHEREAS, warrants have been developed to serve as guidelines
for the installation of traffic control devices.
WHEREAS, in order to consider establishing traffic control
devises in residential areas where such devices are not -warranted
by Federal and State Manuals, findings should be adopted.
NOW, THEREFORE, thea City Council of the City of Poway hereby
porti
adopts that. '
p on of the Caltrans Traffic Manual attached hereto
-` as Exhibit A, and establishes the following findings that must be made by the City council in order to install an "All Way"' stop
intersection in residential, areas where the adopted warrants are
not met.:
1. The approach. speeds for one or more: legs
of the intersection exceed the posted
speed limit.
2.: One or more of the approaches to the inter.
section do not meet City street design
standards.,
3. There are inadequate provisions for pedestrian.
traffic at,or approaching the intersection.
4. The street (s) being stopped is not designated
as a secondary, major, or primary arterial in
the City's adopted circulation element.
PASSED, ADOPTED. and. APPROVED by the City Council of the
City of :Poway ata regular meeting this: day of February 1986..
�-°..arl Kruse,. 't'-'gAY®R. p
ATTEST:: 1
FEB 13 9980 IT EM
Mariorie�,-