
Presentation | 2013
Access Control near Highway Interchanges
- Authored by: Paul Grasewicz
- Event: 2012 National Conference on Access Management
Objectives
- Review origin of current guidelines for access separation from interchange ramps
- Review recent Virginia study on the relationship between access spacing from interchange ramps and crash rates
- Suggest new standards for the optimum access point spacing
Findings and Recommendations: Access Spacing from Interchange Ramp
- Key findings include:
- Regardless of geometric and traffic factors, the crash rate:
- Is dramatically lower at 750 ft and 990 ft spacing from ramps
- Is minimal at 1,320 ft
- No safety improvement: 2,640 ft (1/2 mile) spacing vs. 1,320 ft (1/4 mile)
- No significant difference between urban and rural ramps.
- Regardless of geometric and traffic factors, the crash rate:
- Safety justification for managing access near ramps easy to understand, practical, politically acceptable.
- Example: VA Governors Transportation Strategic Plan goal:
- Improve safety across all modes of transportation by reducing transportation related injuries, fatalities, crashes.
- Example: VA Governors Transportation Strategic Plan goal: