CMF / CRF Details
CMF ID: 9785
Install median w-beam guardrail
Description:
Installation of w-beam guardrail as a median barrier
Prior Condition: Divided highway with open median
Category: Roadside
Crash Modification Factor (CMF) |
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Value: | 1.8 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.25 |
Crash Reduction Factor (CRF) |
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Value: | -80 (This value indicates an increase in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 25 |
Applicability |
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Crash Type: | Other |
Crash Severity: | All |
Roadway Types: | Principal Arterial Other Freeways and Expressways |
Street Type: | |
Minimum Number of Lanes: | |
Maximum Number of Lanes: | |
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: | Not specified |
Traffic Volume: | |
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 |
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Date Range of Data Used: | 2008 to 2012 |
Municipality: | |
State: | IN |
Country: | United States |
Type of Methodology Used: | Regression cross-section |
Sample Size (crashes): | 1604 crashes |
Sample Size (sites): | 1258 sites |
Sample Size (site-years): | 6290 site-years |
Sample Size (miles): | 330 miles |
Sample Size (mile-years): | 1650 mile-years |
Other Details |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Oct 27, 2018 |
Comments: | Applies to barrier-related crashes on one side of a divided highway. Barrier-related crashes include non-cross-median high-risk events, median barrier wall collision, near-median cable barrier collision, far-side median cable barrier collision, median guardrail face collision, non-cross-median moderate-risk event, vehicle redirected and hit another vehicle, roadside guardrail collision, cross-median head-on, and cross-median non-head-on crashes. |