CMF / CRF Details

CMF ID: 2954

Increase speed limit of major road of a 4-leg signalized intersection from less than 50 km/h to greater than or equal to 50 km/h (motorcycle crashes)

Description: Change the speed limit of the major road of a four-legged signalized intersection from less than 50 km/h to greater than or equal to 50 km/h (effect on motorcycle crashes)

Prior Condition: speed limit of less than 50 km/h

Category: Speed management

Study: Applying Bayesian Hierarchical Models to Examine Motorcycle Crashes at Signalized Intersections, Haque et al., 2010

 
Star Quality Rating: 3 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 2.19
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: -119   (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Applicability
Crash Type: All
Crash Severity: All
Roadway Types: Not Specified
Number of Lanes:
Road Division Type:
Speed Limit:
Area Type: Urban
Traffic Volume:
Average Traffic Volume:
Time of Day: All
If countermeasure is intersection-based
Intersection Type: Not specified
Intersection Geometry: 4-leg
Traffic Control: Signalized
Major Road Traffic Volume: Minimum of 5700 to Maximum of 37520 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume: Minimum of 2850 to Maximum of 31270 Annual Average Daily Traffic (AADT)
Average Major Road Volume : 18431 Annual Average Daily Traffic (AADT)
Average Minor Road Volume : 14509 Annual Average Daily Traffic (AADT)
Development Details
Date Range of Data Used: 2003 to 2006
Municipality:
State:
Country: Singapore
Type of Methodology Used: Regression cross-section
Sample Size (crashes): 1948 crashes
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Mar-21-2011
Comments: Only motorcycle related crashes