Traffic Signal Warrant Calculator
Evaluate MUTCD signal warrant criteria from traffic volume, accident history, pedestrian activity, and school zone presence to determine if a traffic signal is justified.
Inputs
Results
Recommendation
Signal may be justified — one or more warrants met
How to Use This Calculator
- Enter Major Street Volume, Minor Street Volume, and Major Street Lanes.
- Set 1 lane each way, 2+ lanes each way, and Minor Street Lanes.
- Adjust 1 lane each way, 2+ lanes each way as needed.
- Review the Recommendation result.
- Use Warrants Met and Warrant 1: Vehicular Volume to inform your decision.
What each input means
- Major Street Volume
- Peak-hour volume on the major (higher-volume) street in both directions.
- Minor Street Volume
- Peak-hour volume on the minor (lower-volume) street, highest approach.
- Major Street Lanes
- Number of through lanes on the major street in each direction.
- Minor Street Lanes
- Number of through lanes on the minor street in each direction.
- Accidents per Year
- Correctable crash count in a 12-month period (susceptible to correction by a signal).
- Pedestrians per Hour
- Peak-hour pedestrian volume crossing the major street.
- School Zone
- Whether this intersection serves as a school crossing.
- Speed Limit
- Posted speed limit on the major street.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersMajor Street Volume = 600, Minor Street Volume = 150, Major Street Lanes = 2, Minor Street Lanes = 1 = 8 input(s) provided
- Calculate RecommendationRecommendationSignal may be justified — one or more warrants met = Signal may be justified — one or more warrants met
- Calculate Warrants MetWarrants Met1 = 1
- Calculate Warrant 1: Vehicular VolumeMET = MET
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