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Option:
08 If the posted or statutory speed limit or the 85th-percentile speed on the major street exceeds 40 mph,or if
the intersection lies within the built-up area of an isolated community having a population of less than 10,000,the
traffic volumes in the 56 percent columns in Table 4C-1 may be used in place of the 80 percent columns.
Section 4C.03 Warrant 2, Four-Hour Vehicular Volume
' Support:
01 The Four-Hour Vehicular Volume signal warrant conditions are intended to be applied where the volume of
intersecting traffic is the principal reason to consider installing a traffic control signal.
' Standard:
02 The need for a traffic control signal shall be considered if an engineering study finds that,for each of
any 4 hours of an average day,the plotted points representing the vehicles per hour on the major street
(total of both approaches)and the corresponding vehicles per hour on the higher-volume minor-street
' approach(one direction only)all fall above the applicable curve in Figure 4C-1 for the existing combination
of approach lanes. On the minor street,the higher volume shall not be required to be on the same approach
during each of these 4 hours.
' Option:
03 If the posted or statutory speed limit or the 85th-percentile speed on the major street exceeds 40 mph,or if the
intersection lies within the built-up area of an isolated community having a population of less than 10,000,
' Figure 4C-2 may be used in place of Figure 4C-1.
Section 4C.04 Warrant 3, Peak Hour
Support:
01 The Peak Hour signal warrant is intended for use at a location where traffic conditions are such that for a
minimum of 1 hour of an average day,the minor-street traffic suffers undue delay when entering or crossing the
major street.
' Standard:
02 This signal warrant shall be applied only in unusual cases,such as office complexes,manufacturing
plants,industrial complexes,or high-occupancy vehicle facilities that attract or discharge large numbers of
vehicles over a short time.
' 03 The need for a traffic control signal shall be considered if an engineering study finds that the criteria in
either of the following two categories are met:
A. If all three of the following conditions exist for the same 1 hour (any four consecutive 15-minute
' periods) of an average day:
1. The total stopped time delay experienced by the traffic on one minor-street approach (one
direction only)controlled by a STOP sign equals or exceeds:4 vehicle-hours for a one-lane
approach or 5 vehicle-hours for a two-lane approach; and
' 2. The volume on the same minor-street approach(one direction only)equals or exceeds 100 vehicles
per hour for one moving lane of traffic or 150 vehicles per hour for two moving lanes; and
3. The total entering volume serviced during the hour equals or exceeds 650 vehicles per hour for
' intersections with three approaches or 800 vehicles per hour for intersections with four or more
approaches.
B. The plotted point representing the vehicles per hour on the major street(total of both approaches)
and the corresponding vehicles per hour on the higher-volume minor-street approach (one
' direction only)for 1 hour (any four consecutive 15-minute periods) of an average day falls above the
applicable curve in Figure 4C-3 for the existing combination of approach lanes.
Option:
04 If the posted or statutory speed limit or the 85th=percentile speed on the major street exceeds 40 mph, or if
the intersection lies within the built-up area of an,isolated community having a population of less than 10,000,
Figure 4C-4 may be used in place of Figure 4C-3 to evaluate the criteria in the second category of the Standard.
05 If this warrant is the only warrant met and a traffic control signal is justified by an engineering study,the
' traffic control signal may be operated in the flashing mode during the hours that the volume criteria of this warrant
are not met.
Guidance:
' 06 If this warrant is the only warrant met and a traffic control signal is justified by an engineering study, the
traffic control signal should be traffic-actuated.
' December 2009 Sect.4C.02 to 4C.04