CMF / CRF Details

CMF ID: 11178

Convert intersection to median U-turn (MUT) intersection

Description:

Prior Condition:  Unsignalized intersection with undivided two-lane two-way 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:85
Crash Modification Factor (CMF)
Value:0.438
Adjusted Standard Error:
Unadjusted Standard Error:0.035
Crash Reduction Factor (CRF)
Value:56.2  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
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:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:
Road Division Type:Undivided
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:mph
Speed Limit Comment:Speed limit for major road approaches ranged from 40 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 6540 to Maximum of 37443 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:Minimum of 176 to Maximum of 7844 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 Cross-Sectional CMF was recommended by the authors.

View the Full Study Details