Highway Traffic and Safety Analyses Lecture 9 Highway

Highway Traffic and Safety Analyses Lecture 9: Highway Capacity Manual 2000 (original presentation by R. Dowling revised and expanded by A. Tarko) Purdue University School of Civil Engineering West Lafayette 1

Lecture Objectives • To highlight the content of the Year 2000 edition of the Highway Capacity Manual. • To help identify suitable procedures in the Manual things and properly apply to traffic operations problems. 2

Purpose of the HCM • “To provide transportation practitioners and researchers with a consistent system of techniques for the evaluation of the quality of service on highway and street facilities. ” • “HCM does not set policies regarding a desirable or appropriate quality of service…” 3

HCM 2000 Formats • Book – Five parts, 35 chapters • CD-ROM – Book – Audio-visual tutorials – CD-ROM presentation 4

HCM 2000 Table of Contents • • • Part I - Overview Part II - Concepts Part III - Methodologies Part IV - Corridor and Areawide Analyses Part V - Simulation and Other Models 5

Part II. Concepts • • Describes factors affecting LOS. Identifies required input. Suggests default values for input. Provides service volume tables 6

HCM Components 7

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HCM Components and Structure • Chapter 9 is Your Gateway to the HCM – Exhibit 9 -1 lists facility types and components. – The same exhibit gives Part II and Part III chapter references for each facility type. • Chapter 9 Provides Guidance on: – Use of defaults. – Use of or development of service volume tables. – Precision and accuracy of results. 9

Chapter 9 Structure of HCM 10

Chapter 9 Structure of HCM 11

Part III. Methodologies • Provides Methodologies to Compute: – Level of Service, Delay, Queues • Contents – Freeway Facilities (4 chapters) – Urban Streets (3 chapters) – Highways (2 chapters) – Pedestrian & Bikeways (1 chapter) – Transit (1 chapter) 12

Intersection Control 13

Required Data for Signals 14

Level of Service Criteria 15

Level of Service Criteria 16

Transit LOS Criteria 17

Part IV. Corridor/Areawide • Purpose: – How to adapt HCM to planning models • Multi-Modal Corridor Analysis – Computation of intensity, duration, extent of congestion (for performance measures) • Areawide Analysis – Capacity analysis for planning models – Speed-flow and node delay equations for models 18

Part V. Simulation • Purpose – Guidance on the use of simulation for conditions beyond the bounds of Part III. • Contents – Chapter 31. Simulation and Other Models – Introduction to simulation techniques 19

Using the HCM 2000 1. Determine Facility Type – See Exhibit 9 -1, Chapter 5 Definitions – Exhibit 29 -2 provides summary. 2. Review Concepts, Inputs, Defaults – Review relevant Part II chapter. 3. Conduct Analysis – Apply relevant Part III chapter. 4. Interpretation of Results – See Chapter 9 discussion on precision. – See end of Part III Chapter for sensitivity discussion 20

CD ROM Tutorials • 4. Delay 3: 35 • 9. Control Delay at Signalized Intersections 5: 50 • 20. Bicycle Events and Hindrance 3: 05 • 21. Bicycle LOS by Facility Types 4: 10 • 32. Transit Quality of Service 5: 05 21

Highway Capacity Software • No official TRB approved software • FHWA sponsored software (2) – Windows (Catalina), – EZ-HCS written in JAVA • Other developers – Mc. Trans, Strong Concepts, Dowling, KLD, etc. 22