CMF / CRF Details

CMF ID: 318

Install a traffic signal

Description:

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   [View score details]
Rating Points Total: 105
Crash Modification Factor (CMF)
Value: 1.5
Adjusted Standard Error:
Unadjusted Standard Error: 0.51
Crash Reduction Factor (CRF)
Value: -50   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 51
Applicability
Crash Type: Rear end
Crash Severity: K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types: Not specified
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather: Not specified
Road Division Type:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
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:
Municipality:
State:
Country:
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. The crash type was initially identified as "all" crashes for this CMF. This has been corrected to reflect Rear End crashes on January 7, 2021.