Extent and Impacts of the VA-DOT Exception Process for Access Management Design Standards

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The Virginia Department of Transportation (VDOT) has released a report that addresses Virginia’s standards and exemption processes for commercial entrance spacing. This report also observes the extent to which commercial access exceptions are used in Virginia, and the impact on crashes at these sites. The previous VDOT Road Design Manual details requirements that new commercial entrances meet certain minimum spacing standards, though landowners may request exemptions. 

Modifications for Private Access Approaches on Limited Access Facilities

  • Posted on: Sun, 10/13/2013 - 22:16
  • By: shroedermay
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Proposed Changes & Improvements

  • Use the county assessed value as the baseline value for calculating the difference vs. going through a costly and time consuming appraisal process.

  • Charge only a percentage of the determined value for changes to residential (less than 10 dwellings) and farm access.

  • Charge full amount of determined value for commercial, retail, etc…

  • Charge an administrative fee for processing requests.

A New Look at Driver Perception - Reaction Time at Driveways

  • Posted on: Fri, 08/30/2013 - 22:53
  • By: fbroen
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Oregon State University

As part of the AMAG project, Karen Dixon used a driving simulator to study the driver perception - reaction time of drivers of different ages. 


  • Defining the Problem
  • Study Currently in Progress
  • Concluding Remarks

Next Steps

Access Connection Issues — Permitting versus Retrofit

  • Posted on: Sat, 07/06/2013 - 18:48
  • By: fbroen
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Access Management Regulations • Roadway Classification • Access Management Standards • Permitting Retrofit Projects • Cost is borne by the public • Benefits accrue to the public Conclusions • B/C criteria are applicable to retrofit projects • Warrants for permitting should be lower than for retrofit

Operational Impacts of Access Management

  • Posted on: Wed, 07/03/2013 - 17:25
  • By: fbroen


Access management treatments inherently reduce conflict points along urban arterial roadways. The reduction in conflict has translated to a reduction in crashes that has been documented in numerous studies looking at “before” and “after” conditions when access management treatments (i.e., raised median installation, driveway consolidation) are implemented. Crash rate reductions as high as 50 percent have been reported in these analyses.