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CE 578 Highway Traffic Operations

CE 578 Highway Traffic Operations. Lecture 12: Auxiliary Lane Sensitivity Analysis and Climbing Lane Warrant. Objectives. Understand significance of variables Application of procedure for climbing lanes. Downstream Effective Length > L t –L u – L pl. Sensitivity Analysis: L t.

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CE 578 Highway Traffic Operations

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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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