2/24/06Michael Dixon1 CE 578 Highway Traffic Operations Lecture 12: Auxiliary Lane Sensitivity Analysis and Climbing Lane Warrant.

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Presentation transcript:

2/24/06Michael Dixon1 CE 578 Highway Traffic Operations Lecture 12: Auxiliary Lane Sensitivity Analysis and Climbing Lane Warrant

2/24/06Michael Dixon2 Objectives Understand significance of variables Application of procedure for climbing lanes

2/24/06Michael Dixon3 Downstream Effective Length > L t –L u – L pl

2/24/06Michael Dixon4 Sensitivity Analysis: L t

2/24/06Michael Dixon5 Sensitivity Analysis: L pl

2/24/06Michael Dixon6 Application Procedure for Upgrade Select highway section Select specific grade Model approaching general terrain section Model specific grade Compare LOS to criteria If AASHTO criteria are met then model climbing lane

2/24/06Michael Dixon7 Selecting Highway Section Bordered by Intersections affecting highway traffic Small variation in volume Contains entire grade

2/24/06Michael Dixon8 Select Specific Grade Single grade Combination of upgrades –Average grade E T, E R, and f G adjustments do not vary linearly with respect to grade This is an approximation

2/24/06Michael Dixon9 Model Approaching General Terrain Section  Use directional analysis procedure

2/24/06Michael Dixon10 Model Specific Grade  Directional analysis using specific grade tables  PTSFd, ATSd

2/24/06Michael Dixon11 Compare LOS to Criteria AASHTO criteria 3.b AASHTO criteria 3.c

2/24/06Michael Dixon12 Model the Climbing Lane Use PTSF d and ATS d Adjust to PTSF pl and ATS pl Compare with and without climbing lane scenarios

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