Development of Left-Turn Warrants for Unsignalized Intersections

Abstract:

Bill Eisele
Development of Left-Turn Warrants for Unsignalized Intersections
TTI

Purpose of NCHRP Project 3-91

  • Develop objective and clear process for selection of left-turn lanes at unsignalized intersections
  • Provide guidance on the design of left-turn lanes

Conclusions

  • Left-turn lane warrants developed for:
    • Rural two-lane highways
    • Rural four-lane highways
    • Urban and suburban (two or four-lane) roadways
  • Methodology can be used with local cost values
  • 2012 TRB paper
Slide List:
  1. Development of Left-Turn Lane Warrants For Unsignalized Intersections
  2. Purpose of NCHRP Project 3-91
  3. Available Guidance
  4. Economic Analysis Procedure
  5. Construction Costs
  6. Delay
  7. Delay Reduction (DR)
  8. Delay Reduction for Entire Year
  9. Safety Improvements
  10. Crash Costs
  11. Example of Crash Savings Calc./ Rural, 2 Lanes, 3 Legs, Stop-Control
  12. Example of Crash Savings Calc./ Rural, 2 Lanes, 3 Legs, Stop-Control
  13. Example of Crash Savings Calc./ Rural, 2 Lanes, 3 Legs, Stop-Control
  14. Example of B/C Calculations/ Rural, 2 Lanes, 3 Legs, Stop-Control
  15. Benefit-Cost Criteria
  16. Rural Two-Lane Highways
  17. Rural Four-Lane Highways
  18. Urban and Suburban
  19. Conclusions
  • Posted on: Fri, 08/30/2013 - 23:14
  • By: fbroen
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