CMF / CRF Details
CMF ID: 2841
Converting four-lane roadways to three-lane roadways with center turn lane (road diet)
Description: Conversion of road segments from a four-lane to a three-lane cross-section with two-way left-turn lanes (also known as road diets).
Prior Condition: Four-lane undivided roadway
Category: Roadway
| Crash Modification Factor (CMF) |
| Value: |
0.47
|
| Adjusted Standard Error: |
|
| Unadjusted Standard Error: |
0.01 |
| Crash Reduction Factor (CRF) |
| Value: |
53
(This value indicates a decrease in crashes)
|
| Adjusted Standard Error: |
|
| Unadjusted Standard Error: |
1 |
| Applicability |
| Crash Type: |
All |
| Crash Severity: |
All |
| Roadway Types: |
Not Specified |
| Number of Lanes: |
4 |
| Road Division Type: |
Undivided |
| Speed Limit: |
|
| Area Type: |
Suburban |
| Traffic Volume: |
|
| Time of Day: |
All |
| If countermeasure is intersection-based |
| Intersection Type: |
|
| Intersection Geometry: |
|
| Traffic Control: |
|
| Major Road Traffic Volume: |
|
| Minor Road Traffic Volume: |
|
| Development Details |
| Date Range of Data Used: |
1982 to 2004 |
| Municipality: |
|
| State: |
|
| Country: |
|
| Type of Methodology Used: |
Before/after using empirical Bayes or full Bayes |
| Sample Size Used: |
Site-years |
| Before Sample Size Used: |
263 Site-years |
| After Sample Size Used: |
67 Site-years |
| Other Details |
| Included in Highway Safety Manual? |
No |
| Date Added to Clearinghouse: |
03-21-2011 |
| Comments: |
|
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