CMF / CRF Details
Implement transit signal priority
Countermeasure ID: 10557
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
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.86 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.033 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 14 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 3.3 |
| Applicability |
|---|
| Crash Type: | All |
| Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
| Roadway Types: | Principal Arterial Other |
| Street Type: | |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | 6 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | |
| Minimum Speed Limit: | 30 |
| Maximum Speed Limit: | 45 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| 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 |
| Municipality: | |
| State: | FL |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| 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 |
| Comments: | |
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