CMF / CRF Details
CMF ID: 8344
Install w-beam guardrail or concrete barrier
Description:
Prior Condition: No roadside barrier
Category: Roadside
Study: Evaluation of the Safety Effectiveness of Installing Roadside Barriers with Different Driver, Vehicle, Weather, and Time of Day Conditions, Park et. al., 2016
Star Quality Rating: | [View score details] |
Rating Points Total: | 110 |
Crash Modification Factor (CMF) | |
---|---|
Value: | 1.01 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.03 |
Crash Reduction Factor (CRF) | |
---|---|
Value: | -1 (This value indicates an increase in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 3 |
Applicability | |
---|---|
Crash Type: | All |
Crash Severity: | All |
Roadway Types: | Principal Arterial Other Freeways and Expressways |
Street Type: | |
Minimum Number of Lanes: | 2 |
Maximum Number of Lanes: | 5 |
Number of Lanes Direction: | |
Number of Lanes Comment: | |
Crash Weather: | Not specified |
Road Division Type: | |
Minimum Speed Limit: | 50 |
Maximum Speed Limit: | 70 |
Speed Unit: | mph |
Speed Limit Comment: | |
Area Type: | Not specified |
Traffic Volume: | Minimum of 35000 to Maximum of 104600 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | |
Time of Day: | All |
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: | 2003 to 2011 |
Municipality: | |
State: | FL |
Country: | |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 2560 crashes before, 2359 crashes after |
Sample Size (sites): | 147 sites before, 147 sites after |
Sample Size (miles): | 68 miles before, 68 miles after |
Other Details | |
---|---|
Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Jan 17, 2017 |
Comments: | CMF is based on a Full Bayes analysis. |