Traffic and Highway Engineering - With Mindtap
5th Edition
ISBN: 9781305360990
Author: Garber
Publisher: CENGAGE L
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Chapter 11, Problem 25P
To determine
The steps in the four-step travel demand forecasting process where feedback can occur and thefeedback loop which directly affects land use.
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The present trip ends and travel time matrix between the zones are shown in Tables 6.75 and 6.76,
respectively. Travel impendance factor between the zones may be assumed to be e-ti. The socio-economic
adjustment factors between the zones may be assumed to one. Calculate the trip interchanges between
the zones by using the gravity model.
TABLE 6.75
Zones Trips produced Trips attracted
1
2
3
2500
3300
3200
TABLE 6.76
1 2 3
1-15 20
2 15
10
3 20 10
I
3000
4000
2000
4. The present trip ends and travel time matrix between the zones are shown in Tables 6.75 and 6.76,
respectively. Travel impendance factor between the zones may be assumed to be e-tij, The socio-economic
adjustment factors between the zones may be assumed to one. Calculate the trip interchanges between
the zones by using the gravity model.
TABLE 6.75
Zones Trips produced Trips attracted
1
2500
3000
2
3300
4000
3
3200
2000
TABLE 6.76
1 2 3
1
15 20
2 15
10
3 20 10
A small town has been divided into three traffic zones. An origin-destination survey was
conducted earlier this year and yielded the number of trips between each zone as shown
in the table below. Travel times between zones were also determined. Provide a trip dis-
tribution calculation using the gravity model for two iterations. Assume K,= 1.
The following table shows the number of productions and attractions in each
zone.
3.
Total
Zone
Productions
250
450
300
1000
Attractions
395
180
425
1000
The survey's results for the zones' travel time in minutes were as follows.
Zone
1
1
4
2.
4
8.
3.
3.
3.
5
The following table shows travel time versus friction factor.
Time (min)
3
4.
6.
7
8.
Friction Factor
82
52
50
41
39
26
20
13
Chapter 11 Solutions
Traffic and Highway Engineering - With Mindtap
Ch. 11 - Prob. 1PCh. 11 - Prob. 2PCh. 11 - Prob. 3PCh. 11 - Prob. 4PCh. 11 - Prob. 5PCh. 11 - Prob. 6PCh. 11 - Prob. 7PCh. 11 - Prob. 8PCh. 11 - Prob. 9PCh. 11 - Prob. 10P
Ch. 11 - Prob. 11PCh. 11 - Prob. 12PCh. 11 - Prob. 13PCh. 11 - Prob. 14PCh. 11 - Prob. 15PCh. 11 - Prob. 16PCh. 11 - Prob. 17PCh. 11 - Prob. 18PCh. 11 - Prob. 19PCh. 11 - Prob. 20PCh. 11 - Prob. 21PCh. 11 - Prob. 22PCh. 11 - Prob. 23PCh. 11 - Prob. 24PCh. 11 - Prob. 25PCh. 11 - Prob. 26PCh. 11 - Prob. 27P
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