8.6. Problems

Try these first

1. 1.

   What is trip production?

   Hint

   Think about where trips start.

2. 2.

   Why is a cost matrix important?

   Hint

   Consider the factors influencing people's transportation choices.

3. 3.

   What do trip productions refer to?

   • Trips drawn to a zone
   • Trips generated from a zone
   • Depreciation of trips

   Hint

   Think about where trips are created.

4. 4.

   Which of the following functions represents the disincentive to travel?

   • f(c) = c^2
   • f(c) = 1/c
   • f(c) = 0

   Hint

   Consider the relationship between cost and travel behavior.

5. 5.

   Given the following trip productions: 150, 160, 170 and attractions: 140, 155, 165, use the gravity model to compute the trip matrix based on a cost matrix. Demonstrate the iterations needed to achieve convergence.

   Hint

   Set your initial balancing factor this time and keep recalculating until you reach minimal error.

6. 6.

   If the cost matrix indicates high costs between two zones, how should that affect trip distribution according to the gravity model? Provide an example.

   Hint

   Consider how cost decreases travel utility.