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Access Management Manual39th Annual Maintenance Management Meeting                   Mobile, AL            Friday, August ...
ALDOT       UA/UTCA   Sain       SkipperAssociates   Consulting
Common Questions• Is a traffic impact study required?• What is the required study area?• How many accesses are allowed?• W...
Traffic Impact Studies• Transportation Impact Analysis for Site  Development: An ITE Recommended Practice  – Suggests that...
Traffic Impact Studies Common land uses and densities that generate > 100 total peak hour trips:                         L...
Decision Tree                                         List of typical land use types/sizes yielding                       ...
Free Standing Discount StoreEXAMPLE 1 8,000 SF                         Land Use                                       Size...
Decision TreeEXAMPLE 1                          Free Standing Discount Store 100 trips = 21,000 SF                        ...
Free Standing Discount StoreEXAMPLE 2 12,000 SF                         Land Use                                       Siz...
Decision TreeEXAMPLE 2                          Free Standing Discount Store 100 trips = 21,000 SF                        ...
Study Area       Development Land Use                           Required Study Area                    Small Developments ...
Number of Connections     Allowable Connections by Parcel Frontage                               Parcel              Allow...
Connection SpacingMinimum Requirements for Connection Spacing                          Minimum Required Spacing        Con...
Median Spacing
Corner SpacingApproaching Intersection   Right-in/Right-out   250 FT minimum
Corner SpacingApproaching Intersection     Right-in only   125 FT minimum
Corner SpacingDeparting Intersection  Right-in/Right-out  250 FT minimum
Corner SpacingDeparting Intersection   Right-out only  125 FT minimum
Turn Lanes           Sample Turn Lane Screening Table                                                            Daily Tur...
Design Elements             Left Turn Lane Geometric Design Elements                    Total TurnDesign Speed       Lane ...
RetrofittingThe primary objectives of Section 6 in theALDOT Access Management Manual includethe following:• Introduce the ...
Retrofitting – When?What situations are commonly considered a“retrofit” where access management techniquesshould be consid...
Retrofitting – ConstraintsWhat are some common constraints?•   Physical limitations•   AASHTO “Green Book”•   Impacts on b...
Retrofitting - TechniquesResurfacing project:•   Driveway consolidation/relocation•   Driveway design (radius, sight dista...
Retrofitting - TechniquesPrivate development driveway permits:• Driveway consolidation/relocation• Driveway spacing criter...
Retrofitting - TechniquesExisting roadway with traffic problems:•   Removal/consolidation of driveways•   Existing traffic...
Retrofitting - TechniquesKey Considerations:• Consider adding a median whenever possible• Consider driveway types• Conside...
Final Steps• Finalize policies & procedures in the manual• Alabama Code/manual execution & approval• Publish the manual• D...
Questions/Contact Info           Steven Jones           sjones@eng.ua.edu                 Jim Meads                 jimmea...
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Access Management Manual

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39th Annual Maintenance Management Meeting in Mobile, AL. August 19, 2011

Jim Meads, P.E. Sain Associates
Darrell Skipper, P.E., Skipper Consulting, Inc.

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Access Management Manual

  1. 1. Access Management Manual39th Annual Maintenance Management Meeting Mobile, AL Friday, August 19, 2011 Jim Meads, P.E. – Sain Associates, Inc. Darrell Skipper, P.E. – Skipper Consulting, Inc.
  2. 2. ALDOT UA/UTCA Sain SkipperAssociates Consulting
  3. 3. Common Questions• Is a traffic impact study required?• What is the required study area?• How many accesses are allowed?• What access spacing is allowed?• Are turn lanes required?
  4. 4. Traffic Impact Studies• Transportation Impact Analysis for Site Development: An ITE Recommended Practice – Suggests that a traffic impact study be conducted when a proposed development is projected to generate 100 or more total peak hour trips
  5. 5. Traffic Impact Studies Common land uses and densities that generate > 100 total peak hour trips: Land Use Size (units) * Residential – Single Family 95 dwelling units Residential – Apartments 150 dwelling units Residential – Townhomes/Condos 200 dwelling units Residential – Assisted Living 455 beds Shopping Center 6,500 SF Fast Food Restaurant w/drive-thru 2,000 SF High-Turnover Sit-Down Restaurant 9,000 SF Quality Restaurant 13,500 SF Gas/Service Station w/Convenience Store 7 fueling positions Bank w/drive-thru 3,900 SF General Office 65,000 SF Medical/Dental Office 31,000 SF Light Industrial/Warehousing 144,000 SF Manufacturing 149,000 SF Hotel/Motel 170 rooms Pharmacy w/drive-thru 9,700 SF Free Standing Discount Store 21,000 SF* Based on methods of ITE publication Trip Generation (8th Edition)
  6. 6. Decision Tree List of typical land use types/sizes yielding ≈ 100 total peak hour vehicle trips • Mixed Use Development • Uncommon Land Use If unclear from typical values in list Trip Generation MemorandumTOTAL PEAK HOUR TRIPS < 50 50 to 99 > 100 Generally NotTURN LANE WARRANTS Required* May Be Required REQUIRED Generally Not Generally NotTRAFFIC IMPACT STUDY Required* Required* REQUIRED * Generally not required, but may be required at the discretion of ALDOT based on local conditions.
  7. 7. Free Standing Discount StoreEXAMPLE 1 8,000 SF Land Use Size (units) * Residential – Single Family 95 dwelling units Residential – Apartments 150 dwelling units Residential – Townhomes/Condos 200 dwelling units Residential – Assisted Living 455 beds Shopping Center 6,500 SF Fast Food Restaurant w/drive-thru 2,000 SF High-Turnover Sit-Down Restaurant 9,000 SF Quality Restaurant 13,500 SF Gas/Service Station w/Convenience Store 7 fueling positions Bank w/drive-thru 3,900 SF General Office 65,000 SF Medical/Dental Office 31,000 SF Light Industrial/Warehousing 144,000 SF Manufacturing 149,000 SF Hotel/Motel 170 rooms Pharmacy w/drive-thru 9,700 SF Free Standing Discount Store 21,000 SF* Based on methods of ITE publication Trip Generation (8th Edition)
  8. 8. Decision TreeEXAMPLE 1 Free Standing Discount Store 100 trips = 21,000 SF Proposed Size = 8,000 SF • Mixed Use Development • Uncommon Land Use If unclear from typical values in list Trip Generation MemorandumTOTAL PEAK HOUR TRIPS < 50 50 to 99 > 100 Generally NotTURN LANE WARRANTS Required* May Be Required REQUIRED Generally Not Generally NotTRAFFIC IMPACT STUDY Required* Required* REQUIRED * Generally not required, but may be required at the discretion of ALDOT based on local conditions.
  9. 9. Free Standing Discount StoreEXAMPLE 2 12,000 SF Land Use Size (units) * Residential – Single Family 95 dwelling units Residential – Apartments 150 dwelling units Residential – Townhomes/Condos 200 dwelling units Residential – Assisted Living 455 beds Shopping Center 6,500 SF Fast Food Restaurant w/drive-thru 2,000 SF High-Turnover Sit-Down Restaurant 9,000 SF Quality Restaurant 13,500 SF Gas/Service Station w/Convenience Store 7 fueling positions Bank w/drive-thru 3,900 SF General Office 65,000 SF Medical/Dental Office 31,000 SF Light Industrial/Warehousing 144,000 SF Manufacturing 149,000 SF Hotel/Motel 170 rooms Pharmacy w/drive-thru 9,700 SF Free Standing Discount Store 21,000 SF* Based on methods of ITE publication Trip Generation (8th Edition)
  10. 10. Decision TreeEXAMPLE 2 Free Standing Discount Store 100 trips = 21,000 SF Proposed Size = 12,000 SF • Mixed Use Development • Uncommon Land Use If unclear from typical values in list Trip Generation MemorandumTOTAL PEAK HOUR TRIPS < 50 50 to 99 > 100 Generally NotTURN LANE WARRANTS Required* May Be Required REQUIRED Generally Not Generally NotTRAFFIC IMPACT STUDY Required* Required* REQUIRED * Generally not required, but may be required at the discretion of ALDOT based on local conditions.
  11. 11. Study Area Development Land Use Required Study Area Small Developments (Outparcel/Small Tract) Fast Food Restaurant Proposed connection point Convenience Store -& - Any single tract development generating All intersections (signalized or unsignalized) < 200 peak hour trips within 1,000 FT of proposed connection point Moderate Developments (Commercial, Industrial, and Residential)Shopping Center or Commercial/Industrial Proposed connection point(s) (<70,000 SF floor space) -&- Residential developments generating All signalized intersections within 1/2 mile < 500 peak hour trips and all unsignalized intersections with 1/4 mile Any development generating between of site property boundaries 200 and 500 peak hour trips Large Developments (Commercial, Industrial, and Residential)Shopping Center or Commercial/Industrial Proposed connection point(s) (>70,000 SF floor space) -& - Residential developments generating All intersections (signalized or unsignalized) > 500 peak hour trips within one (1) mile of site property boundaries Any development generating between > 500 peak hour trips
  12. 12. Number of Connections Allowable Connections by Parcel Frontage Parcel Allowable Frontage Number of Length Connections* < 660 FT 1 660 FT – 1,980 FT 2 > 1,980 FT 3* Subject to minimum trip criteria and other roadway conditions such as proximity to connections from adjacent properties. ALDOT may require fewer connections.
  13. 13. Connection SpacingMinimum Requirements for Connection Spacing Minimum Required Spacing Connection Type < 45 MPH > 45 MPH Directional 440 FT 660 FT Full Access 660 FT 1,320 FT (unsignalized) Full Access 1,320 FT 2,640 FT (signalized)
  14. 14. Median Spacing
  15. 15. Corner SpacingApproaching Intersection Right-in/Right-out 250 FT minimum
  16. 16. Corner SpacingApproaching Intersection Right-in only 125 FT minimum
  17. 17. Corner SpacingDeparting Intersection Right-in/Right-out 250 FT minimum
  18. 18. Corner SpacingDeparting Intersection Right-out only 125 FT minimum
  19. 19. Turn Lanes Sample Turn Lane Screening Table Daily Turning Volume - OR - Operating Peak Hour Speed Turning Volume ADT < 6,000 ADT > 6,000 < 45 mph 30/hour 200/day 100/day 45 - 54 mph 20/hour 150/day 75/day Turn Lane Warrant Turn Lane Warrant > 55 mph Evaluation Required Evaluation RequiredTurn lane screening procedures will be provided for left turn lanes and right turn lanes
  20. 20. Design Elements Left Turn Lane Geometric Design Elements Total TurnDesign Speed Lane Length Taper (MPH) (FT) (FT) 40 325 100 45 375 100 50 425 100 55 465 180 60 500 180 65 550 180 70 600 180 • All turn lane lengths shown account for a 10 MPH deceleration in the through travel lane prior to entering the turn lane. • All turn lane lengths are minimums. Vehicle storage requirements shall be verified and turn lanes shall be lengthened where required.
  21. 21. RetrofittingThe primary objectives of Section 6 in theALDOT Access Management Manual includethe following:• Introduce the reader to the difficulty of retrofitting access management techniques.• Outline some of the techniques used to retrofit access management to existing roads.• Review typical efficiencies of retrofit techniques.• Discuss the success of example previous projects.
  22. 22. Retrofitting – When?What situations are commonly considered a“retrofit” where access management techniquesshould be considered?• ALDOT roadway resurfacing projects• Private development permits on existing roadways• Existing roadways with traffic operations/roadway safety problems
  23. 23. Retrofitting – ConstraintsWhat are some common constraints?• Physical limitations• AASHTO “Green Book”• Impacts on business• Traffic flow effects• Costs and benefits• Legal issues• Political considerations
  24. 24. Retrofitting - TechniquesResurfacing project:• Driveway consolidation/relocation• Driveway design (radius, sight distance, etc.)• Consider closing/relocating median openings• Consider adding a raised/depressed median• Consider existing traffic signal spacing and location
  25. 25. Retrofitting - TechniquesPrivate development driveway permits:• Driveway consolidation/relocation• Driveway spacing criteria**• Consider the turn lane needs/design criteria• Consider restricting driveway types/allowable movements• Consider joint use driveways• Consider frontage roadways• Consider cross access between adjacent properties
  26. 26. Retrofitting - TechniquesExisting roadway with traffic problems:• Removal/consolidation of driveways• Existing traffic signal spacing• Restriction of left turn movements at intersections• Medians (type, median opening spacing, etc.)• Turn lane needs
  27. 27. Retrofitting - TechniquesKey Considerations:• Consider adding a median whenever possible• Consider driveway types• Consider frontage roadways
  28. 28. Final Steps• Finalize policies & procedures in the manual• Alabama Code/manual execution & approval• Publish the manual• Develop a pilot training course for ALDOT personnel• Future training/outreach• Future ALDOT internal training & manual revision process
  29. 29. Questions/Contact Info Steven Jones sjones@eng.ua.edu Jim Meads jimmeads@sain.com Jeff Stephenson jstephenson@sain.com Darrell Skipper darrell@skipperinc.com Cody Long cody@skipperinc.com

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