A Work-Mode–Choice Model

1. You are conducting a trip generation study based on Poisson regression. You estimate the following coefficients for a peak-hour shopping-trip generation model.

BZi = −0.30 + 0.04(household size) + 0.005(annual household income in

thousands of dollars) − 0.12(employment in the household’s

neighborhood in hundreds)

For a household with five members, an annual income of $95,000, and in a neighborhood with an employment of 250, what is the probability of the household making three or more peak-hour trips?

a) 0.071 b) 0.095 c) 0.905 d) 0.024

2. A work-mode–choice model is developed from data acquired in the field in order to determine the probabilities of individual travelers selecting various modes. The mode choices include automobile drive- alone (DL), automobile shared-ride (SR), and bus (B). The utility functions are estimated as:

UDL = 2.6 – 0.3(costDL) – 0.02(travel timeDL)

USR = 0.7 – 0.3(costSR) – 0.04(travel timeSR)

UB = –0.3(costB) – 0.01(travel timeB)

where cost is in dollars and time is in minutes. The cost of driving an automobile is $5.50 with a travel time of 21 minutes, while the bus fare is $1.25 with a travel time of 27 minutes. How many people will use the shared-ride mode from a community of 4500 workers, assuming the shared-ride option always consists of three individuals sharing costs equally?

a) 866 b) 2805 c) 828 d) 314