CMF / CRF Details
CMF ID: 10122
Increase density of access points
Description:
Safety effects on of spacing of access points (intersections and driveways) along a roadway segment
Prior Condition: Access spacing greater than 2,640 ft
Category: Access management
Crash Modification Factor (CMF) |
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Value: | 1.172 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 0.049 |
Crash Reduction Factor (CRF) |
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Value: | -17.2 (This value indicates an increase in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | 4.9 |
Applicability |
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Crash Type: | Other |
Crash Severity: | All |
Roadway Types: | Not specified |
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: | 15 |
Maximum Speed Limit: | 65 |
Speed Unit: | mph |
Speed Limit Comment: | |
Area Type: | Not specified |
Traffic Volume: | Minimum of 10 to Maximum of 18800 Annual Average Daily Traffic (AADT) |
Average Traffic Volume: | 2482 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: | 2012 to 2016 |
Municipality: | |
State: | IA |
Country: | USA |
Type of Methodology Used: | Regression cross-section |
Sample Size (miles): | 5795 miles |
Sample Size (mile-years): | 28975 mile-years |
Other Details |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Jul 26, 2019 |
Comments: | Non-animal crashes. CMF for changing access point spacing greater than 2640ft to 1320-2640ft. |