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Traffic Engineering (5th Edition) by Roger P. Roess, Elena S. Prassas & William R. McShane — A comprehensive textbook bridging theory and practice in traffic engineering. This fifth edition features updated standards (including the latest editions of the

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Traffic Engineering (5th Edition) by Roess, Prassas & McShane delivers a full-spectrum resource for understanding and applying the fundamentals of traffic engineering in modern transportation systems. Structured into four major parts, the text begins with Basic Concepts and Characteristics — introducing transportation modes, road-user and vehicle characteristics, traffic control devices and traffic stream parameters such as flow, speed and density. Pearson Higher Ed +1 Next, the book moves into Traffic Studies and Programs, covering data collection methods, reduction, volume/speed/delay studies and the role of emerging technologies such as connected vehicles and ITS. Pearson Higher Ed The authors then explore Interrupted Flow Facilities, including intersection layout, signalization design and analysis, unsignalized junctions, roundabouts and alternative intersection types. The final part, Uninterrupted Flow Facilities, addresses freeways, weaving segments, merging/diverging operations, and level of service (LOS) for high-speed roadways. This new edition emphasizes conformity with leading standards and manuals: it incorporates updated methods from the Highway Capacity Manual, the Highway Safety Manual and other critical reference works. Pearson Higher Ed Also included are expanded homework problem sets (over 50% new) and modern case studies. The result is a text suited for both upper-level undergraduate and graduate courses in traffic/transportation engineering, as well as a practical reference for practitioners involved in road-network design, planning and operations. Pearson Higher Ed +1 For students, the clear explanations, worked examples and structured progression from basic to advanced topics provide a strong foundation in traffic engineering. For engineers and planners, the comprehensive coverage of traffic flow theory, design guidelines, capacity analysis, traffic operations and traffic safety makes this book a valuable tool in real-world project contexts. If you’re looking for a current, rigorous and applied textbook that spans from traffic data collection to signal timing and freeway operations, Traffic Engineering (5th Edition) stands as a leading choice

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Institution
Engineering Economy
Course
Engineering Economy

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SOLUTIONS

,
th
Traffic Engineering, 5 Edition
Roess, R.P., Prassas, E.S., and McShane, W.R.

Solutions to Homework No. 2

Problem 5‐1

A volume of 1,200 veh/h is observed at an intersection approach. Find the peak flow rate
within the hour for the following peak-hour factors: 1.00, 0.90., 0.80, 0.70. Plot and
comment on the results.

The peak flow rate of flow is computed as v = V/PHF. The table below summarizes the
results for the information given. A plot follows.




Even with the same hourly volume,
a small difference in PHF leads to
an enormous difference in peak
flow rates. Traffic engineers must
be able to deal with this peaking
characteristic on a regular basis.




@@
SeSiesimiciicsiosloaltaiotinon
sm

,Problem 5‐2

A traffic stream displays average vehicle headways of 2.4s at 55 mph. Compute the
density and rate of flow for this traffic stream.

A headway can be converted to a flow rate as follows:



v = 3600 = 3600 = 1,500 veh/hr/ln
h 2.4

Knowing both flow rate and speed (given), the density may now be computed as:


D = v = 1500 = 27.3 veh/hr/ln
S 55



Problem 5‐3

A freeway detector records occupancy of 0.26 for a 15- minute period. If the detector is
3.5 ft long, and the average vehicle has a length of 18 ft. what is the density implied by this
measurement?

Density is obtained from occupancy as follows:




Such a high value is indicative of highly congested conditions within a queue.

,

The following traffic count data were taken from a permanent detector location on a
major state highway. From this data, determine (a) the AADT, (b) the ADT for each
month. (c) the AAWT, and (d) the AWT for each month. From this information, what can
be discerned about the character of the facility and the demand it serves?

The table below illustrates the computation of monthly ADT and AWT values.




The AADT is computed as the total annual volume divided by 365 days, or:


AADT = 2,365,000 = 6,479 veh/day
365

The AAWT is computed as the total weekday volume divided by 260 days, or:

AAWT = 2,067,000 = 7,950 veh/day
260

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