Minimum Traffic Signal Warrants




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ITD 1415 (Rev. 11-04) Minimum Traffic Signal Warrants

City

Date

     

     

Major Street

Minor Street

Speed Limit

Population

Analysis for Year

     

     

     

     

     




Peak 8 Hour Volume (Vehicles and/or Pedestrians per Hour)

Time (Use the same time for both streets)

     

     

     

     

     

     

     

     

Major Street (Total vehicles from both approaches)

     

     

     

     

     

     

     

     

Minor Street (Total vehicles from one direction)

     

     

     

     

     

     

     

     

Pedestrian (Highest volume crossing the major street)

     

     

     

     

     

     

     

     




Warrant

Description

Compliance

Yes

No

1
Eight-Hour

Vehicular

Volume


One of the following conditions exists for each of any 8 hours of an average day:

  1. The VPH given in the 100% column of Table 1-A-1 and Table 1-A-2 exist,

or

  1. The VPH given in the 100% column of Table 1-B-1 and Table 1-B-2 exist.

Volumes on the major street and minor street must be for the same 8 hours. The higher volume on the minor street is not required to be from the same approach during each of these 8 hours.


Option: If the posted speed limit exceeds 40 mph, or if the intersection lies within an isolated community with a population of less than 10,000, the 70% columns may be used in place of the 100% columns.








OR

Both of the following conditions exist for each of any 8 hours of an average day:

  1. The VPH given in the 80% column of Table 1-A-1 and Table 1-A-2 exist,

and

  1. The VPH given in the 80% column of Table 1-B-1 and Table 1-B-2 exist.

Note: The major street and minor street volumes must be for the same 8 hours of each condition, however, the 8 hours satisfied in Table 1-A does not have to be the same 8 hours satisfied in Table 1-B. On the minor street, the higher volume does not need to be from the same approach during each of these 8 hours.










Table 1-A Eight Hour Vehicular Volume

-1. Volume required for each of any 8 hours on major street (Total of both approaches)




-2. Volume required for each of any 8 hours on minor street approach (One direction only)







Number of Lanes

100%

80%

70%

Number of Lanes

100%

80%

70%

Number Hours Met (8 Req'd)

Major Street

Minor Street

Major Street

Minor Street

1

1

500

400

350

1

1

150

120

105

     

2 or more

1

600

480

420

2 or more

1

150

120

105

     

2 or more

2 or more

600

480

420

2 or more

2 or more

200

160

140

     

1

2 or more

500

400

350

1

2 or more

200

160

140

     




Table 1-B Eight Hour Interruption of Continuous Traffic

-1. Volume required for each of any 8 hours on major street (Total of both approaches)




-2. Volume required for each of any 8 hours on minor street approach (One direction only)







Number of Lanes

100%

80%

70%

Number of Lanes

100%

80%

70%

Number Hours Met (8 Req'd)

Major Street

Minor Street

Major Street

Minor Street

1

1

750

600

525

1

1

75

60

50

     

2 or more

1

900

720

630

2 or more

1

75

60

50

     

2 or more

2 or more

900

720

630

2 or more

2 or more

100

80

70

     

1

2 or more

750

600

525

1

2 or more

100

80

70

     



Warrant

Description

Compliance

Yes

No

2
Four-Hour

Vehicular

Volume


For each of any 4 hours of an average day, the plotted points on Figure 1 represent 100% VPH on the major street (total of both approaches.)

and

The VPH on the higher-volume minor street approach (one direction only) fall above the applicable curve for the existing combination of approach lanes.


On the minor street, the higher volume does not need to be from the same approach during each of these 4 hours.
Use Figure 2, 70% chart if the speed limit exceeds 40 mph or if this is an isolated community with a population of less than 10,000.







Figure 1. Warrant 2, Four-Hour Vehicular Volume (100% Factor)


Figure 2. Warrant 2, Four-Hour Vehicular Volume (70% Factor)




Warrant

Description

Compliance

Yes

No

3
Peak Hour

If either of the two following categories (A or B) are met:


  1. 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 vehicle stopped time delay on a 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


  1. The volume on the same minor street approach (one direction only) equals or exceeds:

100 VPH for one moving lane of traffic, or

150 VPH for two moving lanes,



and

  1. The total volume entering during the hour equals or exceeds:

650 VPH for intersections with three approaches, or

800 VPH for intersections with four or more approaches.










OR

B. The plotted point representing the VPH on the major street (total of both approaches) and the corresponding VPH 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 3, Peak Hour (100% Factor) for the existing combination of approach lanes. Use Figure 4, Peak Hour (70% Factor) if the speed limit exceeds 40 mph, or if the intersection lies within a built-up area of an isolated community having a population of less than 10,000.








Notes for 3, Peak Hour

The Peak Hour Signal Warrant is intended for use at a location where, for a minimum of 1 hour of an average day, traffic on the minor street suffers undue delay when entering or crossing the major street. This signal warrant must be applied only in unusual circumstances. Such cases include high-occupancy facilities that attract or release large numbers of vehicles over a short period of time.



Figure 3. Warrant 3, Peak Hour (100% Factor)

Figure 4. Warrant 3, Peak Hour (70% Factor)





Warrant

Description

Compliance

Yes

No

4
Pedestrian

Volume


  1. Pedestrian volume crossing the major street during an average day is 100 or more for each of any 4 hours, or 190 or more during any one hour;

and

  1. There are fewer than 60 gaps per hour in the traffic stream to allow pedestrians to cross during the same period when the pedestrian volume criterion is satisfied. Where there is a divided street having a median of sufficient width for pedestrians to wait, the requirement applies separately to each direction of vehicular traffic. See note on next page.








Warrant

Description

Compliance

Yes

No

5
School

Crossing


  1. Number of gaps in traffic stream during the period children are using the crossing is less than the number of minutes in the same period;

and

  1. At least 20 children use the crossing during the latest crossing hour;








Notes for 4, Pedestrian Volume and 5, School Crossing

Shall not be applied if at location where the distance to the nearest traffic control signal along the major street is less than 300 feet, unless the proposed traffic control signal will not restrict the progressive movement of traffic.




6
Coordinated

Signal System



  1. In a one-way street or on a street that has traffic predominantly in one direction, the adjacent traffic control signals are so far apart that they do not provide the necessary degree of vehicular platooning;

or

  1. On a two-way street, adjacent traffic control signals do not provide the necessary degree of platooning and the proposed and adjacent traffic control signals will collectively provide a progressive movement.








7
Crash

Experience



  1. Adequate trial of alternatives with satisfactory observance and enforcement has failed to reduce the crash frequency;

and

  1. Five or more reported crashes of type susceptible to correction by a traffic control signal have occurred within a 12-month period, each crash involving personal injury or property damage apparently exceeding the applicable requirements for a reportable crash;

and

  1. For each of any 8 hours of an average day, the VPH given in both of the 80% columns in Tables 1-A-1 and 1-A-2 or the VPH in both of the 80% columns in Tables 1-B-1 and 1-B-2 exists on the major street and the higher-volume minor street approach, respectively, to the intersection, or the volume of pedestrian traffic is not less than 80% of the requirements specified in the Pedestrian Volume Warrant. These major street and minor street volumes shall be for the same 8 hours. On the minor street, the higher volume shall not be required to be on the same approach during each of the 8 hours.








8
Roadway

Network


  1. The intersection has a total existing or immediately projected entering volume of at least 1,000 VPH during the peak hour of a typical weekday and has 5-year projected traffic volumes based on an engineering study that meet one or more of Warrants 1,2 and 3 during an average weekday;

or

  1. The intersection has a total existing or immediately projected entering volume of at least 1,000 VPH for each of any 5 hours of a non-normal business day (Saturday or Sunday).

Note: A major route as used in this warrant shall have one or more of these characteristics:



  1. Principal network for through traffic

  2. Includes a highway entering a city

  3. Appears as a major route on an official plan








District Traffic Engineer's Signature

Date










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