MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
5th Edition
ISBN: 9781305577398
Author: Nicholas J. Garber; Lester A. Hoel
Publisher: Cengage Learning US
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Question
Chapter 12, Problem 22P
To determine
A value for the calibration constant for the bus mode that reflects this shift in mode split.
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A mode choice logit model is to be developed based on the following information. A surveyof travellers in an area with bus service found the following data:Model Parameter Auto BusX1, waiting time (min.) 0 10X2, travel time (min.) 20 35X3, parking time (min.) 5 0X4, out-of-pocket cost (cents) 225 100Ak, calibration constant _0.33 _0.27The following utility functions were calibrated based on an observed mode split of 84.9%private auto use and 15.1% bus use.Utility function: Uk = Ak -- 0.10 X1 - 0.13 X2 - 0.12 X3 - 0.0045 X4After implementing service improvements to the buses, the mode split changed to 81.6%private auto use and 18.4% bus use. Determine a value for the calibration constant for the busmode that reflects this shift in mode split.
What is the 85th percentile speed and why is it important to
the transportation engineers? With the data provided in the table
below, plot the cumulative frequency curve on a graph in the next
page and determine the 85th percentile speed.
10.
Table: Spot Speed Dataset of a freeway road section
Spot Speed of Frequency of
Vehicles (mph)
Vehicles (n)
60
61
2
62
6.
63
7
64
24
65
45
66
30
67
12
68
4
69
4
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 12 Solutions
MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
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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- 1. A transportation engineering study was conducted to determine the proper design of bike lanes. Data were gathered on bike - lane widths and average distance between bikes and passing cars. (Use three decimal places) The data from 9 streets are: Distance 2.4 1.5 2.4 1.8 1.8 2.9 1.2 3 1.2 (m) Lane Width 2.9 2.1 2.3 2.1 1.8 2.7 1.5 2.9 1.5 (m) c. If the minimum safe average distance between bikes and passing cars is considered to be 1.8m, determine the corresponding minimum lane width. d. Using the same data, determine the equation of the best fit 2nd degree curvearrow_forward1. A transportation engineering study was conducted to determine the proper design of bike lanes. Data were gathered on bike - lane widths and average distance between bikes and passing cars. (Use three decimal places) The data from 9 streets are: Distance 2.4 1.5 2.4 1.8 1.8 2.9 1.2 3 1.2 (m) Lane Width 2.9 2.1 2.3 2.1 1.8 2.7 1.5 2.9 1.5 (m) a. Manually plot the data (draw to scale) b. Fit a straight line to the data with linear regression. Add this line to the plot.arrow_forwardIt is known that 4000 automobile trips are generated in a large residential area from noon to 1:00 P.M. on Saturdays for shopping purposes. Four major shopping centers have the following characteristics: Distance from Shopping Center Number Commercial Floor Space (in thousands of m^2) Residential Area (km) 4 20 15 3 30 4 14 60 If a logit model is estimated with coefficients -0.283 for distance and 0.172 for commercial space (in thousands of m^2), how many shopping trips will be made to each of the four shopping centers?arrow_forward
- Note: I need right answer with clear calculations . Don't copy from other expert solution.arrow_forwardConsider the following plot of cumulative arriving and departing vehicles at a freeway bottleneck location: Vehicles 20,000 15,000 10,000 5,000 0 0 30 60 90 120 150 180 210 240 270 300 330 360 Time (mins) Arrivals (vehs) Departures (vehs) From this plot, determine the following: A. What is the capacity of the bottleneck location? 9000 whole number, i.e. X000.) B. What is the maximum size of the queue that develops? 3250 whole number, i.e. X000.) C. What is the longest wait time that any vehicle experiences during the breakdown? to the nearest whole number, i.e. XX.) (Hint: Provide the answer as a numerical number only in units of vehicles per hour and rounded to the nearest thousand (Hint: Provide the answer as a numerical number only in units of vehicles and rounded to the nearest thousand (Hint: Provide the answer as a numerical number only in units of minutes and roundedarrow_forwardIt is observed that on an average 4000 vehicle trips take place in a large urban area in the afternoon on Sundays for visiting malls. The characteristics of four main centers are as follows: Shopping Center Number Commercial Floor Space (thousands of m²) Distance from Residential Area (km) 1 4 20 9 15 3 8 30 4 14 60 If a logit model is estimated with coefficients -0.283 for distance and 0.172 for commercial space (in thousands of m2), how many shopping trips will be made to each of the four shopping centers?arrow_forward
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