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CUUATS Transportation Model Report PDF 1 MB Appendix 3 CUUATS Transportation Model Report TRANSPORTATION MODEL LONG RANGE TRANSPORTATION PLAN 2025 Champaign-Urbana Urbanized Area Transportation Study (CUUATS) TABLE OF CONTENTS I. INTRODUCTION .....................................................................................................1 II. DATA DEVELOPMENT.........................................................................................2 1. TRAFFIC ANALYSIS ZONE (TAZ), CENTROIDS, AND EXTERNAL STATIONS.................2 2. NETWORK CODING...................................................................................................2 1) Highway Network................................................................................................7 2) Transit Network ..................................................................................................8 3. SOCIOECONOMIC DATA .......................................................................................... 13 III. DEFINITIONS FOR TRIPS ................................................................................ 14 1. TYPES OF TRIPS ..................................................................................................... 14 2. TRIP PURPOSES ...................................................................................................... 14 IV. TRIP GENERATION........................................................................................... 16 1. OVERVIEW............................................................................................................. 16 2. TRIP PRODUCTION AND ATTRACTION ANALYSIS ..................................................... 17 1. Trip Production................................................................................................. 17 2. Trip Attraction .................................................................................................. 17 3. EXTERNAL TRIPS ANALYSIS ................................................................................... 17 1) Roadside origin-destination survey.................................................................... 18 2) External Trips ................................................................................................... 18 4. BALANCING ........................................................................................................... 21 V. TRIP DISTRIBUTION .......................................................................................... 22 1. OVERVIEW............................................................................................................. 22 2. ESTIMATION OF IMPEDANCES: TRAVEL TIMES......................................................... 23 3. ESTIMATION OF FRICTION FACTOR.......................................................................... 23 4. USE OF GRAVITY MODEL ....................................................................................... 24 VI. MODE CHOICE................................................................................................... 26 1. MODE SPLIT PROCEDURES...................................................................................... 26 2. CREATION OF AN ORIGIN-DESTINATION TRIP TABLE ................................................. 27 VII. TRIP ASSIGNMENT.......................................................................................... 28 1. HIGHWAY TRIP ASSIGNMENT.................................................................................. 28 1) Methodology ..................................................................................................... 28 i 2) Parameters........................................................................................................ 28 2. TRANSIT TRIP ASSIGNMENT.................................................................................... 29 VIII. TIME-OF-DAY ANALYSIS ............................................................................. 30 IX. MODEL VALIDATION....................................................................................... 31 1. PLOT CHECK .......................................................................................................... 31 2. VOLUME CHECK..................................................................................................... 31 1) % Root Mean Square Error............................................................................... 31 2) Average Volume Ratio....................................................................................... 31 3. VEHICLE MILES TRAVELED CHECK......................................................................... 33 X. REFERENCE ......................................................................................................... 34 XI. APPENDICES....................................................................................................... 35 APPENDIX A: HOUSEHOLD SIZE BY TAZ ................................................................ 36 APPENDIX B: EMPLOYMENT BY TAZ................................................................ 40 APPENDIX C: UNBALANCED TRIP PRODUCTIONS AND ATTRACTIONS .... 44 APPENDIX D: BALANCED TRIP PRODUCTIONS AND ATTRACTIONS.......... 47 ii LIST OF FIGURES Figure 1. The Structure of the Four-Step Travel Demand Model ....................................1 Figure 2. Procedures to build transit network...................................................................9 Figure 3. Procedures for building transit skim file ......................................................... 12 Figure 4. Trip Purposes ................................................................................................. 14 Figure 5. Trip Generation Process ................................................................................. 16 Figure 6. Trip Distribution Process................................................................................ 22 Figure 7. Process to Estimate Friction Factors from the Survey..................................... 24 List of Tables Table 1. Node Attributes .................................................................................................7 Table 2. Link Attributes ..................................................................................................7 Table 3. Link Speed/Capacity by functional classification and area type .........................8 Table 4. Link data (Type 1 Data Card) ............................................................................9 Table 5. Speed Curve Use Data (Type 2 Data Card) ...................................................... 10 Table 6. Speed Curve Data (Type 3 Data Card)............................................................. 10 Table 7. Speed curve data used by Champaign-Urbana Urbanized Area ........................ 11 Table 8. Line numbers used in TROUTE.TEM ............................................................. 11 Table 9. Employment Category..................................................................................... 13 Table 10. Summary of the Roadside Origin-Destination Survey.................................... 18 Table 11. Percent Residency and Trip Purposes for CUUATS....................................... 20 Table 12. External Trip Productions and Attractions (Person Trips) .............................. 20 Table 13. Trip Generation Summary ............................................................................. 21 Table 13. Typical Terminal Times for Different Area Types ......................................... 23 Table 14. Calibrated Friction Factors............................................................................. 25 Table 15. Production/Attraction code and Area types used in mode choice model......... 26 Table 16. Volumes by Split Curves ............................................................................... 26 Table 17. BPR curve coefficients for Link Group3........................................................ 29 Table 18. Percentage of peak periods by actual traffic counts done in 2002 (1/09/04).... 30 Table 19. Peak hour traffic volumes for Champaign-Urbana Urbanized Area ............... 30 Table 20. VMT per household and per capita. ............................................................... 33 Table 21. VMT by Road Classification ......................................................................... 33 LIST OF MAPS Map 1. Study Area Boundary for LRTP 2025..................................................................3 Map 2. Traffic Analysis Zones for LRTP 2025................................................................4 Map 3. Highway Network for LRTP 2025.......................................................................5 Map 4. Transit Network for LRTP 2025..........................................................................6 Map 5. Cordon Count Locations.................................................................................... 19 Map 6. Highway Network............................................................................................. 32 iii I. Introduction The purpose of this document is to outline the main processes of creating a transportation model (or “travel demand model”). The model will be used as an analysis tool to evaluate existing and future network conditions as part of the Long Range Transportation Plan 2025. This document is divided into four chapters describing data requirements, definitions that CUUATS staff has developed for model inputs, trip generation process and the trip distribution process. The model uses a four-step travel
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