لایب سان

TRAFFIC ENGINEERING
5TH Edition

Roger P. Roess, Elena S. Prassas, William R. McShane
SOLUTIONS MANUAL

Problem 2-1
The capacity of a street or highway is affected by a) the physical design of the roadway – such features as the number of lanes, free-flow speed, and geometric design, b) the traffic composition – particularly the presence of trucks and local buses, and c) the control environment – such features as lane use controls, signalization, curb lane controls, etc.
Problem 2-2
The capacity of a rapid transit line is affected by: the number of tracks, the person-capacity of each rail car, the length of trains, and the minimum headways at which trains can operate. The latter is limited by either the control system or station dwell times.
Problem 2-3
The key element here is that trains may operate 1.8 minutes apart. In this case, the dwell time controls this limit, not the train control system, which would allow closer operation. Thus, one track can accommodate 60/1.8 = 33.3 (say 33) trains/h.
Each train has 10 cars, each of which accommodates a total of 50+80 = 130 passengers. The capacity of a single track is, therefore:
33*10*130 = 42,900 people/h
Problem 2-4
From Table 2-5 of the text, a freeway with a free-flow speed of 55 mi/h has a vehicle-capacity of 2,250 passenger cars/h.
Traffic contains 10% trucks and 2% express buses, each of which displaces 2.0 passenger cars from the traffic stream. At capacity, there are:
2,250*0.10 = 225 trucks
2,250*0.02 = 45 express buses
Each of these displaces 2.0 passenger cars from the traffic stream. Thus, the 225+45 = 270 heavy vehicles displace 2*270 = 540 passenger cars from the traffic stream. Thus, the number of passenger cars at capacity is:
2,250 – 540 = 1,710 passenger cars
Using the vehicle

Index Solutions to Problems in: Page Chapter 2 ………………………………………………………………………………. 1 Chapter 3 ………………………………………………………………………………. 3 Chapter 4 ………………………………………………………………………………. 9 Chapter 5 ………………………………………………………………………………. 11 Chapter 6 ………………………………………………………………………………. 17 Chapter 7 ………………………………………………………………………………. 23 Chapter 8 ………………………………………………………………………………. 25 Chapter 9 ………………………………………………………………………………. 31 Chapter 10 ………………………………………………………………………………. 37 Chapter 11 ………………………………………………………………………………. 47 Chapter 12 ………………………………………………………………………………. 55 Chapter 13 ………………………………………………………………………………. 67 Chapter 14 ……………………………………………………………………………..... 73 Chapter 15 ……………………………………………………………………………….. 85 Chapter 16 ……………………………………………………………………………….. 103 Chapter 17 ……………………………………………………………………………….. 111 Chapter 18 ……………………………………………………………………………….. 115 Chapter 19 ……………………………………………………………………………….. 123 Chapter 20 ……………………………………………………………………………….. 147 Chapter 21 ……………………………………………………………………………….. 161 Chapter 22 ……………………………………………………………………………….. 169 Chapter 23 ……………………………………………………………………………….. 179 Chapter 24 ……………………………………………………………………………….. 183 Chapter 25 ……………………………………………………………………………….. 185 Chapter 26 ………………………………………………………………………………. 197 Chapter 27 ………………………………………………………………………………. 203 Chapter 28 ………………………………………………………………………………. 213 Chapter 29 ………………………………………………………………………………. 223 Chapter 30 ………………………………………………………………………………. 239 Chapter 31 ………………………………………………………………………………. 259

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