CMF / CRF Details

CMF ID: 11180

Convert intersection to media U-turn (MUT) intersection

Description:

Prior Condition: Unsignalized intersection with divided four-lane boulevard major approaches and stop-controlled minor approach

Category: Intersection geometry

Study: Safety Performance of Unsignalized Median U-Turn Intersections, Jonathan Kay, Timothy J. Gates, Peter T. Savolainen, and Md Shakir Mahmud, 2022

 
Star Quality Rating: 3 Stars   [View score details]
Rating Points Total: 80
Crash Modification Factor (CMF)
Value: 1.325
Adjusted Standard Error:
Unadjusted Standard Error: 0.059
Crash Reduction Factor (CRF)
Value: -32.5   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type: All
Crash Severity: O (property damage only)
Roadway Types: All
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:
Road Division Type: Divided by Median
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit: mph
Speed Limit Comment: Speed limit for major road approaches ranged from 35 mph to 65 mph. Speed limit for minor road approaches ranged from 25 mph to 55 mph.
Area Type:
Traffic Volume:
Average Traffic Volume:
Time of Day:
If countermeasure is intersection-based
Intersection Type: Roadway/roadway (not interchange related)
Intersection Geometry: Not specified
Traffic Control: Uncontrolled
Major Road Traffic Volume: Minimum of 3855 to Maximum of 37443 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume: Minimum of 119 to Maximum of 8099 Annual Average Daily Traffic (AADT)
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:
Municipality:
State: MI
Country: USA
Type of Methodology Used:
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Aug-25-2022
Comments: The paper develops CMFs using both Cross-Sectional and EB Before-After analysis, and that the EB CMF was recommended by the authors.