CMF / CRF Details

CMF ID: 316

Install a traffic signal


Prior Condition: No Prior Condition(s)

Category: Intersection traffic control

Study: NCHRP Report 491: Crash Experience Warrant for Traffic Signals, McGee et al., 2003

Star Quality Rating: 3 Stars
Crash Modification Factor (CMF)
Value: 0.86
Adjusted Standard Error: 0.38
Unadjusted Standard Error: 0.32
Crash Reduction Factor (CRF)
Value: 14   (This value indicates a decrease in crashes)
Adjusted Standard Error: 38
Unadjusted Standard Error: 32
Crash Type: All
Crash Severity: K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Not specified
Number of Lanes:
Road Division Type:
Speed Limit:
Area Type: Urban
Traffic Volume:
Average Traffic Volume:
Time of Day:
If countermeasure is intersection-based
Intersection Type: Roadway/roadway (not interchange related)
Intersection Geometry: 3-leg
Traffic Control: Stop-controlled
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:
Type of Methodology Used: Before/after using empirical Bayes or full Bayes
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-01-2009
Comments: Countermeasure name has been slightly modified for consistency across Clearinghouse