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Understanding Highway Traffic Operations: Auxiliary Lane Sensitivity and Climbing Lane Analysis

This lecture delves into the significance of various variables affecting highway traffic operations, focusing on auxiliary lane sensitivity analysis and climbing lane warrants. Key objectives include understanding the application procedure for climbing lanes, selecting appropriate highway sections and grades, modeling general terrain sections, and comparing Level of Service (LOS) to established AASHTO criteria. The process emphasizes directional analysis, adjustments for specific grades, and practical evaluations through scenarios with and without climbing lanes.

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Understanding Highway Traffic Operations: Auxiliary Lane Sensitivity and Climbing Lane Analysis

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  1. CE 578 Highway Traffic Operations Lecture 12: Auxiliary Lane Sensitivity Analysis and Climbing Lane Warrant Michael Dixon

  2. Objectives • Understand significance of variables • Application of procedure for climbing lanes Michael Dixon

  3. Downstream Effective Length > Lt –Lu – Lpl Michael Dixon

  4. Sensitivity Analysis: Lt Michael Dixon

  5. Sensitivity Analysis: Lpl Michael Dixon

  6. 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 Michael Dixon

  7. Selecting Highway Section • Bordered by Intersections affecting highway traffic • Small variation in volume • Contains entire grade Michael Dixon

  8. Select Specific Grade • Single grade • Combination of upgrades • Average grade • ET, ER, and fG adjustments do not vary linearly with respect to grade • This is an approximation Michael Dixon

  9. Model Approaching General Terrain Section • Use directional analysis procedure Michael Dixon

  10. Model Specific Grade • Directional analysis using specific grade tablesPTSFd, ATSd Michael Dixon

  11. Compare LOS to Criteria • AASHTO criteria 3.b • AASHTO criteria 3.c Michael Dixon

  12. Model the Climbing Lane • Use PTSFd and ATSd • Adjust to PTSFpl and ATSpl • Compare with and without climbing lane scenarios Michael Dixon

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