Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 19, Problem 14P
To determine
The design of a flexible pavement using the 1993 AASHTO procedure.
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Neglect Wave pressure, silt pressure, ice force and carth quake force)
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In this question, we are going to learn about the gravity model. As discussed in class, an
alternative and frequent way to model the demand is doing it in 4 steps:
Generation/Attraction, Distribution, Mode choice, and Route choice. In the
generation/attraction step, we estimate the number of trips that depart and arrive from each
zone, in a similar way as we studied generation in the lectures. The idea of the distribution step
is, taking the generation and attraction numbers as known, estimate the number of people
going from each zone to each zone. Let's be precise:
Consider that you know O₂ for every zone i, representing the number of users that have i as
their origin. Similarly, you know Dj, representing the number of users that have j as their
destination. We want to estimate Mij, i.e., the number of users going from i to j. The matrix M
=
a2+
Assume an origin is connected to a destination with two routes. Assume the travel time of each
route has a linear relationship with the traffic flow on the route (t₁ = α₁ + b₁x₁ ; t₂
b2x2). Determine under what condition (e.g. a relationship among the parameters of the
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