Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 12, Problem 8P
To determine
The trip distribution calculation using the gravity model for two iterations.
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Determine the trip distribution matrix using "Gravity Model" of transport system with
given the data:
Trip Production of Zones 1, 2 and 3, correspondingly are 500, 600, and 800 tpd
Trip Attraction of Zones 1, 2 and 3, correspondingly are 600, 700 and 600 tpd
Miami, Oklahoma has three transportation analysis zones, and origin-destination survey results. Using a spreadsheet, provide a trip distribution calculation using the gravity model. The following table shows the number of productions and attractions in each zone, as well as the socioeconomic adjustment factor.
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.
Chapter 12 Solutions
Traffic and Highway Engineering
Ch. 12 - Prob. 1PCh. 12 - Prob. 2PCh. 12 - Prob. 3PCh. 12 - Prob. 4PCh. 12 - Prob. 5PCh. 12 - Prob. 6PCh. 12 - Prob. 7PCh. 12 - Prob. 8PCh. 12 - Prob. 9PCh. 12 - Given a table with production and attraction data,...
Ch. 12 - Given a table with production and attraction data,...Ch. 12 - Prob. 12PCh. 12 - Prob. 13PCh. 12 - Prob. 14PCh. 12 - Prob. 15PCh. 12 - Prob. 16PCh. 12 - Prob. 17PCh. 12 - Prob. 18PCh. 12 - Prob. 19PCh. 12 - Prob. 20PCh. 12 - Prob. 21PCh. 12 - Prob. 22PCh. 12 - Prob. 23PCh. 12 - Prob. 24PCh. 12 - Prob. 25PCh. 12 - Prob. 26PCh. 12 - Prob. 27PCh. 12 - Prob. 28P
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- Given a table with production and attraction data, determine the number of productions and attractions that should be used for each zone in the second iteration.arrow_forward1. Assume that the following goals have been established for a transportation planning study.Goal 1: The transportation system should provide mobility for all segments of the population.Goal 2: The transportation system should minimize the impact on the natural environment.Define at least three objectives for each goal that could be used to achieve the stated purpose. 2. From the sketch below, calculate the interzonal trips due to 450 work trips produced at zone i. There are 750 attractions at zone 1, 400 attractions at zone 2, and 300 attractions at zone 3. The exponent of travel time is 0.6 and the travel times are 9 minutes to zone 1, 5 minutes to zone 2, and 7 minutes to zone 3. Assume all socioeconomic adjustment factors and the value of C are equal to 1.0.arrow_forwardA small town has two residential zones, A and B producing 900 and 600 work trips respectively. Zones C, D and E are work opportunity zones attraction 900,400 and 200 trips. The travel times between the zones and actual obsrved trips are as shown in the attachment below;arrow_forward
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- Given 1000 trips, how many trips should be assigned to route 4 using the constant assignment ratio? Route Time in hours 1 1 2 1.5 3 2 4 2.5 5 3arrow_forwardHow to calculate trip generation using household income and car ownershiparrow_forwardA neighborhood has 180 households with the characteristics shown in the table below. A count model for peak-hour work trips is described in the second table. How many trips do you expect from this neighborhood?arrow_forward
- 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 time DL) USR = 0.7 – 0.3(costSR) – 0.04(travel time SR) UB = –0.3(costB) – 0.01(travel time B) 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?arrow_forwardA large residential area has 1500 households with an average household income of $15,000, an average household size of 5.2, and, on the average, 1.2 working members. Using the model below, predict the change in the number of peak-hour social/recreational trips if employment in the area increased by 20% and household income by 10%. number of peak-hour vehicle-based social/recreational trips per household = 0.04 + 0.018(household size) + 0.009(annual household income [in thousands of dollars]) + 0.16(number of nonworking household members) Round off final answers to whole number.arrow_forwardA large residential area has 1500 households with an average household income of $15,000, an average household size of 5.2, and, on the average, 1.2 working members. Using the model below, predict the change in the number of peak hour social/recreational trips If employment in the area increased by 20% and household income by 10%. number of peak-hour vehicle-based social/recreational trips per household 0.04 + 0.018(household size)+ 0.009(annual household income in thousands of dollars)+ 0.16(number of nonworking household members)arrow_forward
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