CMF / CRF Details
CMF ID: 3855
Convert diamond interchange to Diverging Diamond Interchange (DDI) or Double Crossover Diamond (DCD)
Description:
Convert a diamond interchange to a Diverging Diamond Interchange (DDI) or a Double Crossover Diamond (DCD)
Prior Condition: Diamond interchange
Category: Interchange design
Crash Modification Factor (CMF) |
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Value: | 0.63 |
Adjusted Standard Error: | |
Unadjusted Standard Error: | |
Crash Reduction Factor (CRF) |
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Value: | 37 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: | |
Applicability |
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Crash Type: | All |
Crash Severity: | O (property damage only) |
Roadway Types: | Principal Arterial Interstate |
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: | Divided by Median |
Minimum Speed Limit: | |
Maximum Speed Limit: | |
Speed Unit: | |
Speed Limit Comment: | |
Area Type: | Urban |
Traffic Volume: | |
Average Traffic Volume: | |
Time of Day: | All |
If countermeasure is intersection-based |
Intersection Type: | Roadway/roadway (interchange ramp terminal) |
Intersection Geometry: | 4-leg |
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: | 2004 to 2010 |
Municipality: | Springfield |
State: | MO |
Country: | U.S.A. |
Type of Methodology Used: | Simple before/after |
Sample Size (crashes): | 364 crashes before, 46 crashes after |
Other Details |
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Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Jun 04, 2012 |
Comments: | The authors computed the CMF from Figure S-4 (p. 18). Traffic volumes for route 13 are given in Figure TO-1 but not for the ramps (p. 10). |