Lab Exercise 1: The Gravity Model

The four-zone city of Wocsom’s trip generation characteristics are shown below, in addition to a travel network for the city. There are two major activities in this lab assignment:

1. Use the trip generation information provided to distribute the trips between the four zones.
2. Using the results of the trip distribution analysis and the results of the network analysis, assign the trips to the various links.

The four-zone city has the following productions and attractions:

Tasks to be Completed

Task 1: Distribute the trips for the city of Wocsom using the gravity model. Use the given data to develop a trip table for the four-zone city of Wocsom.

Task 2: Find the shortest path from nodes A,B,C, and D to all other nodes and intersections.

Task 3: Using the trip table (veh/hr) below, load the network and find the total volume on each link assuming all or nothing assignment.

Task 4: Using the trip table resulting from the gravity model above, load the network and find the total volume on each link, assuming all or nothing assignment.

Task 5: Prepare a brief report documenting your analysis, and be sure to explain the differences and similarities in the results of Task 3 and Task 4.

Assumptions

For your analysis using the gravity model, assume the socioeconomic factor K_ij=1.0.