Wal-Mart Sub-Regional Meeting Access Management


Published on

ALDOT Permitting

Jim Meads and Randy Braden

May 2, 2007

Published in: Business, Technology
  • Be the first to comment

  • Be the first to like this

No Downloads
Total views
On SlideShare
From Embeds
Number of Embeds
Embeds 0
No embeds

No notes for slide

Wal-Mart Sub-Regional Meeting Access Management

  1. 1. Wal-MartSub-Regional Meeting Access Management ALDOT Permitting Jim Meads & Randy Braden Sain Associates, Inc. May 2, 2007
  2. 2. What is Access Management? Access management preserves safe and efficient traffic movement, while allowing reasonable access to property. Sounds easy, but the application to individual cases is extremely difficult… especially without an access management policy.
  3. 3. What Does Access Management Do?  Preserves street capacity.  Reduces traffic accidents  Preserves value of adjacent property  Manages congestion
  4. 4. Access Management Techniques Increase spacing between signals and interchanges Driveway location, spacing and design Use of exclusive turning lanes Median treatments/channelization Use of service and frontage roads
  5. 5. Typical ArterialHighway Life Cycle New Arterial Increased Accessibility Higher Land Values
  6. 6. Arterial Life Cycle New Arterial Increased Accessibility Higher Land ValuesIncreased Changed Traffic Land Use
  7. 7. Arterial Life Cycle New Arterial Demanded! Increased Deteriorated AccessibilityLevel of Service More Traffic Higher Land Values Conflicts Increased Changed Traffic Land Use
  8. 8. Preserving Traffic Flow Alabama in 2000 Conclusions  Alabamians are mobile  Growing faster than national average Few Choices –Tolerate congestion and crashes –Massive road building (new revenues) –Other strategies… access management
  9. 9. The Effects of Poor Access Management Congestion, possible gridlock Frustrated drivers Frequent traffic accidents Continuous strip development Decreased property values Commercial establishments struggling to survive Complaints about congestion, noise, safety Pressure on government to improve street
  10. 10. The Effects of Effective Access Management Fewer and less severe crashes Less stop and go traffic, less delay Increased and preserved capacity More attractive corridors, livable communities Preservation of private investment in abutting properties Consistency in handling requests for driveways
  11. 11. Access Management Works Reduces crashes as much as 50% Increases capacity 23-45% Reduces travel time and delay by 40-60% Extends highway life Treats permit applicants consistently Decreases fuel consumption by 35%
  12. 12. How Do You Apply Access Management ? Limit the number of conflict points Separate conflict locations Remove turning vehicles from the through lanes Reduce turning movements Improve driveway operations
  13. 13. Ways to Limit Conflicts Purchase access rights Non-traversable median “Right in, right out” Channelization to discourage left turns Remove TWLTL
  14. 14. R Insert figs 3-1 and 3-2 9 total conflicts
  15. 15. 32 totalconflicts
  16. 16. Right in, Right Out 2 Conflicts
  17. 17. Separating Conflicts Set minimum access spacing, corner distance, and property line clearance Limit number of egresses per property Designate driveway location Consolidate access driveways Optimize driveway spacing
  18. 18. Remove Turn Vehicles From Thru Lanes Left turns are major cause of delay and major cause of accidents Turning vehicles have high speed differentials (severe collisions)
  19. 19. Figure 1-3: Intersection/drivewaytraffic crashes by maneuver (NHI, 2003) 16% 27% 47% 10%
  20. 20. Removing Turning Vehicles Install left-turn deceleration bay at existing median Install raised median with left turn-bays Install right-turn deceleration lane Install continuous right-turn lane
  21. 21. Reducing Turning Movements Accidents are proportional to traffic volumes  Require connections between parcels  Require internal circulation  Require alternate access points  Require shared access  Adopt vehicle use limitations  Many similar treatments
  22. 22. Shared Access
  23. 23. Improve Driveway Operations  Adequate sight distance  Smooth vertical geometry  Adequate radii  Adequate throat width and length  Well signed and marked
  24. 24. 6) Improve Driveway Operations (sample of methods) Inadequate storage distance Inadequate Entry Throat Length
  25. 25. Access Management Guidelines When, where and how to provide access 3) Intersection functional area and sight distance 4) Turn lanes 5) Median openings 6) Traffic signal spacing 7) Driveway location and design
  26. 26. Intersection Functional Areas Functional area varies by approach
  27. 27. Turn Lanes Allow speed change Store turning vehicles• Left-turn bays• Right-turn bays• Acceleration & deceleration lanes• Warrants• Design criteria
  28. 28. Reducing Conflict Points on an Arterial
  29. 29. Driveway Spacing Illustration
  30. 30. Driveways
  31. 31. Encourage adjacent properties to share accessJoint or shared access connections onto a roadway minimize the number of conflict points.
  32. 32. Coordinate driveway locations on both sides of the roadwayAlign access into a four-leg intersection or on low- volume low-speed roadways provide sufficient offset distance to avoid spillback problems.
  33. 33. Install driveway channelizing island to discourage left-turn maneuvers.Channelizing medians are used to restrict left- turn movements and limits crossing conflicts.
  34. 34. Maximize corner clearance by locating access as far from the intersection as possibleMove or locate driveways as far from anintersection as possible helps to separate conflict points and improve safety and
  35. 35. Separate left-turn entrances and exits at major traffic generatorsReplaces either one or two full-movement access connections with two limited-turn connections with separated left-turn movements
  36. 36. Construct or modify median to allow only left turns from a major roadwayReduces the number of conflict points and delays. Adequate provisions should be made for vehicles that cannot make direct left-turn exits.
  37. 37. ALDOT GOALS SAFETY Improved access along State Routes Efficient permit process Clear guidelines
  38. 38. ALDOT Structure MONTGOMERY Division DivisionDistrict District District District
  39. 39. Key Items Does the District and/or Division have a checklist for Plans and Permitting? (See Handouts) How long does the review take? Who do we submit the plans to? How many sets? Who do we follow up with for status weekly status updates? If the final District Submittal has been there for longer than a month, call Randy Braden!
  40. 40. Best Permitting Practices Involve ALDOT EARLY and OFTEN Have a site meeting in the concept phase with the following in attendance:  Division Traffic Engineer  District Engineer  Division Maintenance Engineer  State Permit Engineer
  41. 41. What not to do!