TRANSCAD教程6：DEMAND FORECASTING: TRAFFIC ASSIGNMENT

  the Total VHT (Vehicle-Hours-Traveled) and Total VMT (Vehicle-Miles-TraveLED) that are important performance measures for the Highways/Streets network. Save tcw_rep.txt to the working directory. In the interim and final reports, always include these traffic assignment outputs. Theme maps should also be created to graphically present network flows and to illustrate where congested links are.

HELP: Displaying Theme Maps
If assistance is needed in creating and displaying theme maps, then Click HERE.

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5.3 Model Validation

Compare your base assignment with the observed network flow pattern displayed in Figure 4 (volumes in 1000s of vph ). Construct a minimum of three screen lines across which total flows will be measured and compared. These screen lines, for example, might capture all flow across the network from east to west, or all flows into the downtown zones (1 and 2). Provide screen line summary schematics, graphs, and/or tables, clearly identifying the screenlines and associated traffic volumes. Specify deviations between observed and estimated link volumes. Discuss the accuracy of your model system.

HELP: Creating and Report Screenlines
If assistance is needed in creating and reporting screenlines, then Click HERE.

+---------------------------------------------------------------+

| PM-peak (5-6 PM) Link Volumes (1000s vph to nearest 100)    N |

|                                                            W+E|

|            0.4      0.02         0.1   0.3                  S |

+        1--+---+-----------------------+---+--5                |

|            0.6|     0.02
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