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2001 Edition Page 437
' Option:
18 At an intersection with a high volume of left-turn traffic from the major street,the signal warrant analysis
may be performed in a manner that considers the higher of the major-street left-turn volumes as the"minor-street"
volume and the corresponding single direction of opposing traffic on the major street as the"major-street"volume.
14 For signal warrants requiring conditions to be present for a certain number of hours in order to be satisfied,
any four sequential 15-minute periods may be considered as 1 hour if the separate 1-hour periods used in the
' warrant analysis do not overlap each other and both the major-street volume and the minor-street volume are for
the same specific one-hour periods.
15 For signal warrant analysis,bicyclists may be counted as either vehicles or pedestrians.
Support:
16 When performing a signal warrant analysis,bicyclists riding in the street with other vehicular traffic are usually
counted as vehicles and bicyclists who are clearly using pedestrian facilities are usually counted as pedestrians.
' Option:
17 Engineering study data may include the following:
A. The number of vehicles entering the intersection in each hour from each approach during 12 hours of an
' average day. It is desirable that the hours selected contain the greatest percentage of the 24-hour traffic volume.
B. Vehicular volumes for each traffic movement from each approach,classified by vehicle type(heavy trucks,
passenger cars and light trucks,public-transit vehicles,and,in some locations,bicycles),during each
15-minute period of the 2 hours in the morning and 2 hours in the afternoon during which total traffic
' entering the intersection is greatest.
C. Pedestrian volume counts on each crosswalk during the same periods as the vehicular counts in Item B
and during hours of highest pedestrian volume. Where young,elderly,and/or persons with physical or
t visual disabilities need special consideration,the pedestrians and their crossing times may be classified by
general observation.
D. Information about nearby facilities and activity centers that serve the young,elderly,and/or persons with
disabilities,including requests from persons with disabilities for accessible crossing improvements at the
' location under study. These persons might not be adequately reflected in the pedestrian volume count if
the absence of a signal restrains their mobility.
E. The posted or statutory speed limit or the 851-percentile speed on the uncontrolled approaches to the location.
' F. A condition diagram showing details of the physical layout,including such features as intersection
geometrics,channelization,grades,sight-distance restrictions,transit stops and routes,parking conditions,
pavement markings, roadway lighting, driveways,nearby railroad crossings,distance to nearest traffic
control signals,utility poles and fixtures,and adjacent land use.
G. A collision diagram showing crash experience by type,location,direction of movement,severity,weather,
time of day,date,and day of week for at least 1 year.
18 The following data,which are desirable for a more precise understanding of the operation of the intersection,
may be obtained during the periods described in Item B of Paragraph 17:
A. Vehicle-hours of stopped time delay determined separately for each approach.
B. The number and distribution of acceptable gaps in vehicular traffic on the major street for entrance from
the minor street.
C. The posted or statutory speed limit or the 85`i-percentile speed on controlled approaches at a point near to
the intersection but unaffected by the control.
D. Pedestrian delay time for at least two 30-minute peak pedestrian delay periods of an average weekday or
' like periods of a Saturday or Sunday.
E. Queue length on stop-controlled approaches.
Section 4C.02 Warrant 1, Eight-Hour Vehicular Volume
Support:
01 The Minimum Vehicular Volume, Condition A,is intended for application at locations where a large volume of
intersecting traffic is the principal reason to consider installing a traffic control signal.
02 The Interruption of Continuous Traffic, Condition B,is intended for application at Iocations where Condition A
is not satisfied and where the traffic volume on a major street is so heavy that traffic on a minor intersecting street
suffers excessive delay or conflict in entering or crossing the major street.
03 It is intended that Warrant 1 be treated as a single warrant. If Condition A is satisfied,then Warrant 1 is
satisfied and analyses of Condition B and the combination of Conditions A and B are not needed. Similarly,if
Condition B is satisfied, then Warrant 1 is satisfied and an analysis of the combination of Conditions A and B is
not needed.
December 2009 Sect.4C.01 to 4C.02