CMF / CRF Details
CMF ID: 5460
Convert an open median to a left-in only median
Description:
Convert a full median opening to a left-in only median
Prior Condition: Roadways with full median openings
Category: Access management
Crash Modification Factor (CMF) |
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Value: | 0.93 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.2429 |
Crash Reduction Factor (CRF) |
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Value: | 7 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 24.29 |
Applicability |
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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: | 4 |
Maximum Number of Lanes: | 6 |
Number of Lanes Direction: | |
Number of Lanes Comment: | |
Crash Weather: | Not specified |
Road Division Type: | Divided by Median |
Minimum Speed Limit: | 40 |
Maximum Speed Limit: | 55 |
Speed Unit: | mph |
Speed Limit Comment: | |
Area Type: | Urban and suburban |
Traffic Volume: | Minimum of 45000 to Maximum of 75000 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | |
Time of Day: | Not specified |
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 |
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Date Range of Data Used: | 2003 to 2010 |
Municipality: | Tampa |
State: | FL |
Country: | |
Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
Sample Size (crashes): | 40 crashes after |
Other Details |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Apr 30, 2014 |
Comments: | CMF for KAB crashes (based on the KABCO scale). The SPF only included VMT. It was not clear if annual calibration factors or other methods were used to account for trends. |