Wal-MartSub-Regional Meeting Access Management ALDOT Permitting Jim Meads & Randy Braden Sain Associates, Inc. May 2, 2007
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.
What Does Access Management Do? Preserves street capacity. Reduces traffic accidents Preserves value of adjacent property Manages congestion
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
Typical ArterialHighway Life Cycle New Arterial Increased Accessibility Higher Land Values
Arterial Life Cycle New Arterial Increased Accessibility Higher Land ValuesIncreased Changed Traffic Land Use
Arterial Life Cycle New Arterial Demanded! Increased Deteriorated AccessibilityLevel of Service More Traffic Higher Land Values Conflicts Increased Changed Traffic Land Use
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
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
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
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%
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
Ways to Limit Conflicts Purchase access rights Non-traversable median “Right in, right out” Channelization to discourage left turns Remove TWLTL
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
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)
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
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
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
Intersection Functional Areas Functional area varies by approach
Encourage adjacent properties to share accessJoint or shared access connections onto a roadway minimize the number of conflict points.
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.
Install driveway channelizing island to discourage left-turn maneuvers.Channelizing medians are used to restrict left- turn movements and limits crossing conflicts.
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
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
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.
ALDOT GOALS SAFETY Improved access along State Routes Efficient permit process Clear guidelines
ALDOT Structure MONTGOMERY Division DivisionDistrict District District District
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!
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