PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
7th Edition
ISBN: 9781119610526
Author: Mannering
Publisher: WILEY
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Chapter 8, Problem 11P
To determine
The distribution of trip among possible destinations.
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The following 3 Travel Demand Forecasting models were created to estimate the number of peak-hour trips in the suburb of Croydon:
T1 = 1.0 + 0.3(household size) + 0.01(household income in thousands of $)
T2 = 1.5 + 0.2(household size) + 0.01(household income in thousands of $)
T3 = 0.5 + 0.5(household size) + 0.01(household income in thousands of $)
The suburb has a total of 3500 households with an average of 4 people per household, an average household income of $90,000 and survey data shows that it generates a total of 11,550 trips in the peak-hour. Which of the above models is the most accurate?
A. T1
B. T2
C. T3
D. Can't say as 2 or more models are equally accurate.
Determine the share (proportion) of person-trips by each of two modes (private auto
and mass transit) using the multinomial logit model and given the following informa-
tion:
Utility function: U = A - 0.05 T – 0.04 T, – 0.03 T, –0.014 C
Parameter
Private Auto
Mass Transit
= access time (min.)
T.
T = waiting time (min.)
T, = riding time (min.)
C = out-of-pocket cost (cents)
Calibration constant, A
14
20
25
%3D
50
70
250
100
-0.012
-0.068
A simple work-mode-choice model is estimated from data in a small urban area 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), and the utility functions are estimated
as:
UDL = 2.2-0.2(costp)-0.03(travel timepz)
USR
0.8 – 0.2(costsR) – 0.03(travel timesR)
Us = -0.2(costa)- 0.01(travel time,)
where cost is in dollars and time is in minutes. Between a residential area and an industrial
complex, 4000 workers (generating vehicle-based trips) depart for work during the peak hour. For all
workers, the cost of driving an automobile is $6.00 with a travel time of 20 minutes, and the bus
fare is $1.00 with a travel time of 25 minutes. If the shared-ride option always consists of two
travelers sharing costs equally, how many workers will take each mode?
Chapter 8 Solutions
PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
Ch. 8 - Prob. 1PCh. 8 - Prob. 2PCh. 8 - Prob. 3PCh. 8 - Prob. 4PCh. 8 - Prob. 5PCh. 8 - Prob. 6PCh. 8 - Prob. 7PCh. 8 - Prob. 8PCh. 8 - Prob. 9PCh. 8 - Prob. 10P
Ch. 8 - Prob. 11PCh. 8 - Prob. 12PCh. 8 - Prob. 13PCh. 8 - Prob. 14PCh. 8 - Prob. 15PCh. 8 - Prob. 16PCh. 8 - Prob. 17PCh. 8 - Prob. 18PCh. 8 - Prob. 19PCh. 8 - Prob. 20PCh. 8 - Prob. 21PCh. 8 - Prob. 22PCh. 8 - Prob. 23PCh. 8 - Prob. 24PCh. 8 - Prob. 25PCh. 8 - Prob. 26PCh. 8 - Prob. 27PCh. 8 - Prob. 28PCh. 8 - Prob. 29PCh. 8 - Prob. 30PCh. 8 - Prob. 31PCh. 8 - Prob. 32PCh. 8 - Prob. 33PCh. 8 - Prob. 34PCh. 8 - Prob. 35PCh. 8 - Prob. 36PCh. 8 - Prob. 37PCh. 8 - Prob. 38PCh. 8 - Prob. 39P
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