CMF / CRF Details

CMF ID: 3041

Presence of grade-separated interchange

Description: This CMF represents the expected change in crashes for high-capacity roadways with at least one grade-separtated interchange compared to those segments with no access points.

Prior Condition:  Cross-sectional comparison of high-capacity roadways in Spain with and without grade-separated interchanges.

Category: Access management

Study: Evaluation Of The Effectiveness Of Safety-Based Incentives In Public Private Partnerships: An Empirical Analysis For The Case Of Spain, Thais Rangel, José Manuel Vasallo, and Blanca Arenas, 2011

Star Quality Rating:2 Stars  [View score details]
Rating Points Total:50
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.78
Crash Reduction Factor (CRF)
Value:-77  (This value indicates an increase in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:78
Crash Type:All
Crash Severity:K (fatal)
Roadway Types:Not Specified
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:All
Traffic Volume:Minimum of 1094 to Maximum of 213544 Annual Average Daily Traffic (AADT)
Average Traffic Volume:30277 Annual Average Daily Traffic (AADT)
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
Date Range of Data Used:1996 to 1996
Type of Methodology Used:Regression cross-section
Sample Size (miles):4800 miles
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jul 15, 2011