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Introduction to Transportation Engineering

Introduction to Transportation Engineering. Instructor Dr. Norman Garrick Hamed Ahangari 6 th March 2014. Trip Distribution. Gravity Model. Example 1. Calibration Factor, c = 1.5 Socio-economic factor, k ij = 1.0. Target-Year Inter-zonal Impedances, { Wij }-Given.

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Introduction to Transportation Engineering

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  1. Introduction to Transportation Engineering Instructor Dr. Norman Garrick Hamed Ahangari 6th March 2014

  2. Trip Distribution

  3. Gravity Model

  4. Example 1 Calibration Factor, c = 1.5 Socio-economic factor, kij= 1.0

  5. Target-Year Inter-zonal Impedances, {Wij}-Given

  6. Step 1- Calculate Friction Factors, {Fij}

  7. Step 2- Find Denominator of Gravity Model Equation {AjFijKij}

  8. AjFijKij Step 3- Find Probability that Trip i will be attracted to Zone j, {pij} pij= Σ(AjFijKij)

  9. Step 4- Find Trip Interchanges, {Tij} Tij= Pipij

  10. Zone 1 Zone 2 612 7 173 50 1 16 108 30 306 • Zone 4 • Zone 3 38 22

  11. Example 2 UConn.

  12. Calibration Factorc = 2.0 Socioeconomic Adj. FactorK = 1.0

  13. Calculations-1

  14. Calculations-2

  15. Trip Distribution Results 1000 trips 333 trips 667 trips

  16. Mode Choice

  17. Example 1 Calculate the mode shares for auto and light rail transit (LRT) using the utility function given. • uk = ak – 0.045 Ta – 0.03 Tw – 0.01 Tr– 0.005 C where: Ta - access time, Tw- waiting time, Tr- riding time, C- out of pocket cost

  18. Modes Specifications

  19. Key formulas

  20. Utility Calculations uk = ak – 0.045 Ta – 0.03 Tw – 0.01 Tr– 0.005 C

  21. Mode choice Estimation

  22. Policy AnalysisWhich policy may promote transit? 1-Applying congestion pricing for Auto mode ( Increase the cost of auto to 120) 2- Improving transit by decreasing waiting time to 5 minute

  23. Scenario Analysis Congestion Pricing Increase Train Frequencies

  24. Comparing Results

  25. Example 2Mode choice: Storrs to NYC • Available modes: • Auto (Private car ) • Bus • Train (From New haven) uk = ak – 0.0075 X1 – 0.012 X2 • X1: TravelCost • X2: travel Time

  26. Mode Characteristics - Auto

  27. Mode Characteristics - Bus

  28. Mode Characteristics - Train

  29. Modes Characteristics

  30. Utility Calculations

  31. Mode choice Estimation

  32. Scenario 2- New Utility Function(Sensitive to Out of Vehicle time) • uk = ak – 0.0075 X1 – 0.012 X2 – 0.036 X3 • X1: TravelCost,X2: in vehicle travel Time • X3:out of vehicle travel Time

  33. Modal Choice in Scenario 2

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