Post Lecture Questions.pdf

The problem involves a transportation network with multiple modes, zones, and links, and requires analysis of trip production, trip distribution, modal split, and traffic assignment.

For the OD-estimation problem, the network has three origins and three destinations, with given travel demand and link travel times. The questions ask to determine the number of travelers assigned to link 3, update the OD trip matrix based on a counter on link 4, and discuss the possibility of uniquely determining the OD trip matrix using link counts.

In the second part, a new zone is added to the network, and the questions ask to determine the minimum number of counts needed to determine the flow AB, and the number of counts needed to determine the flows AB, AC, and CB.

The full 4-stage model involves a transportation network with car and train modes, and requires determining trip production, travel time impedance matrices, trip distribution, and link flows. The questions ask to determine the trip production for origins A, B, and C, the travel time impedance matrices for car and train, and the car trip matrix using the doubly constrained gravity model.

The problem also involves plotting the trip frequency distribution for the car, determining the link flows for cars in a deterministic user equilibrium assignment, and analyzing the effect of transfer delays for trains on the car flow.

Key concepts include deterministic user equilibrium, OD-estimation, trip production, trip distribution, modal split, and traffic assignment. The problem requires applying these concepts to a complex transportation network with multiple modes and zones.