Planning and Preliminary Engineering Guide For Using the Highway Capacity Manual - PowerPoint PPT Presentation

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Planning and Preliminary Engineering Guide For Using the Highway Capacity Manual

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  1. Planning and Preliminary Engineering Guide For Using the Highway Capacity Manual NCHRP 7-22 Workshop

  2. Agenda • The Project (9:00 AM) • Overview of the Guide (9:30 AM) • Case Studies • Long Range Regional Plan Update (10:30 AM) • Freeway Master Plan (11:30 AM) • Urban Street BRT Project Planning (2:00 PM) • System Performance Monitoring (2:45 PM) • Wrap Up (3:15 PM)

  3. 1. NCHRP 7-22 Project

  4. NCHRP 7-22 • To develop a guide to help planners take advantage of the HCM to improve their results. • Status • Stakeholder workshops held to identify planning needs and how the HCM might help. • Initial rough draft guide for stakeholder review (October) • Revised draft guide for panel review in December. • Final guide submitted for publication June 2015

  5. The People • The Research Team • Kittelson & Associates - Rick Dowling, Paul Ryus • North Carolina State University - Bastian Schroeder • University of Idaho - Michael Kyte • Stantec – Tom Creasey • The Panel

  6. 2. Overview of Guide 09:30

  7. Contents • Part I - How To Use the Guide • Long and Short Range Areawide Planning • Project Traffic and Environmental Studies • Highway Performance Monitoring • Part 2 – Procedures • Part 3 – Case Studies • Long Range Regional Transportation Plan Analysis • Freeway Future Conditions Analysis • Analysis of BRT Project on Urban Street • Roadway System Monitoring

  8. Part 1- Gateway to the Guide

  9. Part 1- Gateway to the Guide

  10. Part 1- Gateway to the Guide

  11. Part 2 - Procedures • Default Values • Generalized Service Volume Tables • Working with Traffic Demand Data • Intersection Traffic Control • Guidance for Freeways • Guidance for Multilane Highways • Guidance for Two-Lane Highways • Guidance for Urban Streets • Guidance for Signalized Intersections • Guidance for Stop-Controlled Intersections • Guidance for Roundabouts • Guidance for Interchange Ramp Terminals • Guidance for Off-Street Pathways • Guidance for Corridors • Guidance for Areas and Systems Input Data Facilities Intersections Other

  12. Part 2 – Section E:Freeway Procedures • E1. Overview • E2. Computational Tools • E3. Data Needs • E4. Estimating Inputs • Free flow Speed • Capacity • E5. Performance Measures • Speed • Level of Service • Queues • Reliability

  13. First Page - Intro

  14. Freeway Data Needs

  15. Typical Procedures

  16. Part 2 – Section H:Urban Street Procedures • H1. Overview • H2. Computational Tools • H3. Data Needs • H4. Segment Performance • H5. Intersection Perform. • H6. Facility Performance

  17. First Page

  18. Urban Street Data Needs

  19. Typical Procedure

  20. Part 2 Section I –Signalized Intersections • I1. Overview • I2. Computational Tools • I3. Data Needs & Limits • I4. Performance Estimation • Screening – Critical Lane Vol. • v/c ratio • Delay • LOS • Queue • Reliability (sensitivity analysis) • Bike/Ped LOS – see Section M

  21. Signalized Intersection Data Needs

  22. Part 2 Section O –Areawide Analyses • O1. Overview • O2. Computational Tools • O3. Data Needs • O4. Estimate Demand Model Inputs • Free-Flow Speed • Capacity • O5. Performance Measures • Auto – V/C, Speed, VHT, Delay, LOS, Density, Queue, Reliability.

  23. Data Needs – Areawide Analysis

  24. “No-Fault” Capacity Look Up Table

  25. Multimodal LOS Dashboard – For Systems

  26. Comments So Far? • Outline and Contents of Guide (Part 1, 2, 3) • What do you like so far? • What do you dislike? • What is missing?

  27. 3. Case studies 10:30

  28. Case Study #1 – Regional Planning

  29. Case 1 - LRTP • Fresno COG 2040 Regional Transportation Plan • - 6,000 square miles • - 1 million population

  30. Objectives • Conduct transportation performance and investment alternatives analysis required to update 2040 LRTP • Auto, truck, bus, bicycle, and pedestrian analyses to be performed. • Travel Demand Forecasting Model to be Used

  31. Example Problems • Example Problems that Develop Demand Model Inputs • Example I.1 – Estimation of Free-Flow Speeds and Capacities • Example I.2 – HCM Based Volume-Delay Functions • Example Problems Post Processing Demand Model Outputs • Example I.3 – Estimating Speeds for Air Quality & Noise Analysis • Example I.4 – Screening for Auto V/C and LOS Hot Spots • Example I.5 – Predicting Queues & Delay • Example I.6 – Interpretation of Results • Example I.7 – Prediction of Reliability • Example I.8 – Transit, bicycle, and pedestrian LOS screening • Example I.9 – Truck LOS screening

  32. Example I.1 – estimating Free-flow Speeds & Capacities • Objective • To develop lookup table of free-flow speeds and capacities for coding the highway network • Approach • Step 1: Identify facility categorization scheme • Step 2: Determine free-flow speeds • Step 3: Determine capacities

  33. Picking facility TYpes

  34. For Free-Flow Speeds • Consult Appropriate HCM Chapter for Procedure, or • Use Posted Speed Limit + 5 mph

  35. For Free-Flow Speeds • Consult Appropriate HCM Chapter for Procedure, or • Use Posted Speed Limit + 5 mph

  36. Use “No-Fault” Capacity Table from part 2 - Section o Arterial/Collector assume 1900 ideal sat flow rate

  37. Pick 80% HCM PC Capacity Arterial/Collector assume 1900 ideal sat flow rate

  38. Example Result

  39. Comments? • Example I.1 – Creation of free-flow speed and capacity look-up tables

  40. Example #I.2 – HCM Based Volume-delay Functions • Objective • To select an HCM based volume-delay function for demand model • Approach • Step 1: Select volume-delay function type • BPR and Akcelik • Step 2: Set parameters • Match Speed at Capacity • Compute Akcelik parameter • Compute BPR parameter • Step 3: Select preferred volume-delay function

  41. Akcelik Where: T0 = Free-flow travel time X = volume/capacity ratio J = calibration parameter L = length of the link

  42. BPR Where: T0 = Free-flow travel time X = volume/capacity ratio A = speed at capacity calibration parameter B = rate of travel time increase calibration parameter

  43. Smooth vs Rough Pipe BPR Akcelik Everybody waits their turn here. Everybody goes slow entire length T Free-Flowing here

  44. Splitting Smooth & Rough PipeS BPR Akcelik 0.5 T or T T or 2T T Problem for DTA, No Problem for SUE Models No Problem for DTA, Problem for SUE Models

  45. Comparing Speeds

  46. Comparing Speeds Speed at Capacity

  47. Calibrating to Speed at Capacity Akcelik BPR

  48. Calibrated Curves

  49. All Get Same Speed at Capacity Speed at Capacity

  50. Comparing Travel Times