CMF / CRF Details

CMF ID: 10556

Implement transit signal priority

Description: Transit signal priority (TSP) is a type of transit preferential treatment implemented at signalized intersections to reduce (bus or urban rail) transit delays by providing extended or early green time 3 to transit vehicles in operation.

Prior Condition: No Prior Condition(s)

Category: Transit

Study: Developing Florida-specific Mobility Enhancement Factors (MEFs) and Crash Modification Factors (CMFs) for TSM&O Strategies, Alluri et al., 2020

Star Quality Rating: 4 Stars   [View score details]
Rating Points Total: 125
Crash Modification Factor (CMF)
Value: 0.88
Adjusted Standard Error:
Unadjusted Standard Error: 0.02
Crash Reduction Factor (CRF)
Value: 12   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 2
Crash Type: All
Crash Severity: All
Roadway Types: Principal Arterial Other
Number of Lanes: 2-6
Road Division Type:
Speed Limit: 30-45mph
Area Type: Urban
Traffic Volume: Minimum of 1500 to Maximum of 41000 Annual Average Daily Traffic (AADT)
Average Traffic Volume: 19122 Annual Average Daily Traffic (AADT)
Time of Day:
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
Traffic Control:
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used: 2014 to 2018
State: FL
Country: USA
Type of Methodology Used: 2
Sample Size (sites): 12 sites before, 12 sites after
Sample Size (miles): 17.6 miles before, 17.6 miles after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Dec-17-2020