CMF / CRF Details
CMF ID: 9651
Flatten horizontal curve
Description:
Prior Condition: Roadways with shaper horizontal curves
Category: Alignment
Study: A Before-After Evaluation of the Realignment of Horizontal Curves on Rural Two-Lane Roads, Srinivasan et al., 2018
Star Quality Rating: | [View score details] |
Rating Points Total: | 115 |
Crash Modification Factor (CMF) | |
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Value: | 0.259 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.086 |
Crash Reduction Factor (CRF) | |
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Value: | 74.1 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 8.6 |
Applicability | |
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Crash Type: | All |
Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
Roadway Types: | All |
Street Type: | |
Minimum Number of Lanes: | 2 |
Maximum Number of Lanes: | 2 |
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: | Rural |
Traffic Volume: | Minimum of 400 to Maximum of 12000 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | 3480 Annual Average Daily Traffic (AADT) |
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: | 1997 to 2013 |
Municipality: | |
State: | CA,NC,OH |
Country: | |
Type of Methodology Used: | Before/after using comparison group |
Sample Size (crashes): | 109 crashes before, 10 crashes after |
Sample Size (sites): | 39 sites before, 39 sites after |
Sample Size (site-years): | 220 site-years before, 130 site-years after |
Other Details | |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Oct 27, 2018 |
Comments: | Information on years of data were provided by the study author. |