Study Details
Study Title: Revision of the Hand Book of Road Safety Measures
Authors: Elvik, R. and Erke, A.
Publication Date: 2007
Abstract:
Study Citation: Elvik, R. and Erke, A., "Revision of the Hand Book of Road Safety Measures: Grade-separated junctions." (3-27-2007)
CMFs Associated With This Study
Category: Interchange design
Countermeasure: Convert at-grade intersection into grade-separated interchange
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.58[B] | 42 |  | All | All | Not Specified | Not Specified |
Countermeasure: Design diamond, trumpet, or cloverleaf interchange with crossroad above freeway
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.96[B*] | 4 | | All | All | Not Specified | Not Specified |
Countermeasure: Modify two-lane-change to one-lane-change merge/diverge area
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.68[B] | 32 | | All | All | Not Specified | Not Specified |
Countermeasure: Provide cloverleaf ramp instead of long ramp
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.77 | 23 | | All | All | Not specified | Not specified |
Countermeasure: Provide diamond interchange
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.89 | 11 | | Truck related | All | Not specified | Not specified |
| 0.93 | 7 | | All | All | Not specified | Not specified |
| 1.43 | -43 | | Truck related | All | Not specified | Not specified |
| 0.62 | 38 | | All | All | Not specified | Not specified |
| 0.98 | 2 | | All | All | Not specified | Not specified |
| 0.91 | 9 | | All | All | Not specified | Not specified |
| 0.9 | 10 | | Truck related | All | Not specified | Not specified |
Countermeasure: Provide long ramp instead of shortramp
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.62 | 38 | | All | All | Not specified | Not specified |
Countermeasure: Provide short ramp instead of directional loop ramp
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.7 | 30 | | All | All | Not specified | Not specified |
Countermeasure: Provide straight ramp instead of cloverleaf ramp
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.55 | 45 | | All | All | Not specified | Not specified |
Countermeasure: Provide tight-urban-diamond interchange (TUDI)
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 1.02 | -2 | | All | All | Not specified | Not specified |
