8.3. Growth Factor Methods

Try these first

1. 1.

   Define the term 'growth factor'.

   Hint

   Think about how you increase quantity in math.

2. 2.

   What does a trip matrix represent?

   Hint

   Consider it a table of interactions.

3. 3.

   What is the formula for the Uniform Growth Factor model?

   • Tij = f * tij
   • Tij = tij / f
   • Tij = tij + f

   Hint

   Think about how you increase counts.

4. 4.

   True or False: The Doubly Constrained model allows for different growth rates for trips originating and terminating.

   • True
   • False

   Hint

   Consider the flexibility of this method.

5. 5.

   If the original trip counts for zones are 60, 70, and 80, and the growth factor is 2.0, calculate the new trip counts. Then, explain the implication of using such a high growth factor.

   Hint

   Double the original numbers and reflect on what this means for planning.

6. 6.

   Using the doubly constrained model, you have a production total of 250 with a new attraction total expected to be 230. Describe the steps you would take to adjust your trip distribution model accordingly.

   Hint

   Think about balancing weights... you want both sides to equal!