VDOT Access Management Regulations and Standards Part 2

• Authored by:  Paul Grasewicz
• Co-authored by:  Andy Boenau
• Event:  2012 National Conference on Access Management

Evaluation of Spacing Standards: 2011

• Original intent – periodic review.
• 75+ exceptions approved during past 3 years
• Input from VDOT staff and transportation consultants
• Updates to standards effective Jan 2012
• Reduce standards with numerous exceptions
• Lower  ½ mile signal spacing – speed limits < 50 mph
• Eliminate urban/rural criteria
• Separate spacing for intersections vs. full access entrances
• Reduce intersection spacing near interchange ramps
• 2008 VA Tech study on crash rates near ramps 

2008 VA Study found 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 spacing vs. 1,320 ft