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2012 ITE Annual Conference Allen Nie, PhD, PE, HMM June 24 -27, Santa Barbara, CA

2012 ITE Annual Conference Allen Nie, PhD, PE, HMM June 24 -27, Santa Barbara, CA. SR 46 Improvement PSR/PDS Study. Presentation Outline. Background Improvement Alternatives Traffic Modeling Traffic Operations Analysis Project Status Lessons Learned. Project Location – Paso Robles. Wasco.

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2012 ITE Annual Conference Allen Nie, PhD, PE, HMM June 24 -27, Santa Barbara, CA

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  1. 2012 ITE Annual ConferenceAllen Nie, PhD, PE, HMMJune 24 -27, Santa Barbara, CA SR 46 Improvement PSR/PDS Study

  2. Presentation Outline • Background • Improvement Alternatives • Traffic Modeling • Traffic Operations Analysis • Project Status • Lessons Learned

  3. Project Location – Paso Robles Wasco Cambria

  4. SR 46 E in Paso Robles

  5. Past Studies • SR 46 E Comprehensive Traffic Survey, 2005 • Golden Hill Retail Center TIA, 2007 • State Route 46 E Parallel Routes Study, 2008 • SR 46 E Comprehensive Corridor Study, 2009 • Paso Robles General Plan Update, 2011

  6. Existing Intersection & Mainline LOS

  7. 2025 Intersection & Mainline LOS

  8. Delays Source: Caltrans SR 46 E CCS

  9. Paso Robles Land Use

  10. Traffic Issues – Local Perspective S

  11. Improvements along SR 46

  12. The PSR Project Team

  13. Alignment Alternatives • ALT 1 –Two-way Stop-controlled (No Build) • ALT 2 – Signalization • ALT 3 – Roundabout (West) • ALT 4 – Roundabout (East) • ALT 5 – Overcrossing • ALT 6 – Interchange

  14. ALT 4 – Roundabout (East)

  15. ALT 6 – Interchange

  16. Caltrans’ Responsibility • Maintain / Increase Hwy 46 throughput • Reduce travel delay • Traffic controls (signal) • Congestion (queue spillovers, weaving issues, etc) • Improve travel time reliability • Multimodal and safety • Vision - grade separation, limited # of access points

  17. City’s Expectation • Easy access to Highway 46 and US 101 • Better & reliable connectivity • Support multimodal transportation (bike & Ped) • Fit into the City’s Circulation Master Plan • Cost concerns • Phased development

  18. City’s Circulation Master Plan

  19. Work Process Kickoff Meeting Field Survey Traffic Data Project Management and QA/QC Alternative Development Traffic Modeling Operational Analysis Alternative Assessment

  20. City of Paso Robles Traffic Model • City model based on the SLOCOG county model • Three-step highway model • Feedback loop • Detailed GIS roadway network • Horizon years modeled • 2008 • 2030

  21. Traffic Model Enhancement Post-processing

  22. Model Enhancement

  23. Day of Week Fluctuation Highway 46 Vs. Local Arterial

  24. Traffic Model Calibration Before Model Calibration After Model Calibration

  25. GEH Statistics (Before) Traffic Simulation Criteria: 85% (GEH < 5) (After)

  26. Seasonal Fluctuation

  27. Ramifications of Traffic Fluctuation • Data Collection • Use of old counts – consistency issue • Model Calibration • which month? • Previous studies failed to consider this • Traffic operations • Worst or average • Design • For the worst?

  28. Traffic Operations Analysis • Intersections • Signalized • Stop-controlled • Roundabout • Hwy 46 multilane highway • Hwy 46 Weaving • Simulation (optional)

  29. Finalized Study Scenarios & Elements

  30. Preliminary Results: 2016 No Build

  31. Performance Comparison To be updated!

  32. Project Status • Data Collection - done • Alignment Alternative - 90% • Model Development & Calibration - Approved • Traffic Forecast – 85% • Traffic Operations Analysis – 25% • Overall project - Ahead of schedule

  33. Challenges & Lessons Learned • Data Collection • Seasonal & day of week fluctuation • Timing / consistency • Always validate your data • Scenarios Management • Communication • Work closely with all stokeholds • Consensus Building • Use your traffic model

  34. Thank you! Questions & Answers

  35. Hatch Mott MacDonald Allen Nie, PhD, PE Tel: 925.469.8016 allen.nie@hatchmott.com Richard Davis, VP Tel: 925.469.5356 richard.davis@hatchmott.com 4301 Hacienda Dr., Suite 300 Pleasanton, CA 94588 Fax: 925.469.8011 www.hatchmott.com

  36. Stop right here • Stop right here

  37. City Zoning

  38. Project Development Process Caltrans

  39. Project Study Report • Initial document of the project • Include • Scoping of the physical work • Budget and schedule to deliver the project • Define the needs and purpose • Timeframe • 6 months to 12 months

  40. Draft Project Report • A decision making document • Document the need for a project • Summarize • Key points from the Draft Env. Doc • The studies of the scope, cost • Overall impact of alternatives • Help make informal decision whether to proceed to the public hearing phase of the project

  41. ALT 1 – Two-way Stop-controlled (No Build)

  42. ALT 2 – Signalization

  43. ALT 3 – Roundabout West

  44. ALT 5 – Overcrossing

  45. Future Year O-D Calculation The Difference Method

  46. Half Clover Leaf Interchange

  47. Roundabout Alternative

  48. Background

  49. The Consideration of Recession • People are talking about it • Not enough data to fully measure the impact on traffic level in the project study area • Would be a decision from the City and Caltrans • To consider it at all? • Which growth pattern to choose?

  50. The Impact of Recession Legend Line 1: w/o recession Lines 2 - 5: w/ recession 1 2 5 3 4

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