# homework Traffic and Highway Engineering, 5th Edition

Chapter 1 The Profession of Transportation

1. What is the total number of miles of public roadways in your state?
What percentage of the highway system mileage is maintained by the
state government (as opposed to local and federal government)? What
percentage of the total public highway system in your state is
comprised of Interstate highways?

Note: These data are available from the Internet site of FHWA’s Office
of Highway Policy Information at

1. Estimate the number of personal motor vehicles in your city or state.
What is the total number of miles driven each year? How much
revenue is raised per vehicle per year for each 1 cent/gallon tax?
Assume that the average vehicle achieves 25 miles per gallon in fuel
economy.
2. A state has a population of 17 million people and an average
ownership of 1.1 cars per person, each driven an average of 12,000
mi/year, at an average fuel economy of 24 mi/gal of gasoline (mpg).
Officials estimate that an additional \$60 million per year in revenue
will be required to improve the state’s highway system, and they have
proposed an increase in the gasoline tax to meet this need. Determine
the required tax in cents per gallon.

Chapter 2 Transportation Systems and Organizations

4. Abridgehasbeenconstructedbetweenthemainlandandanisland.
The total cost (excluding tolls) to travel across the bridge is expressed
as C = 50 + 0.5V, where V is the number of veh/hr and C is the
cost/vehicle in cents. The demand for travel across the bridge is V =
2500 −10C.

2

(a) Determine the volume of traffic across the bridge.
(b) If a toll of 25 cents is added, what is the volume across the bridge?
What volume would be expected with a 50 cent increase?
(c) A tollbooth is to be added, thus reducing the travel time to cross
the bridge. The new cost function is C = 50 + 0.2V. Determine the
volume of traffic that would cross the bridge.
(d) Determine the toll to yield the highest revenue for demand and
supply function in part (a), and the associated demand and revenue.

1. Considerationisbeinggiventoincreasingthetollonabridgenow
carrying 4500 veh/day. The current toll is \$1.25/veh. It has been
found from past experience that the daily traffic volume will decrease
by 400 veh/day for each 25¢ increase in toll. Therefore, if x is the
increase in toll in cents/veh, the volume equation for veh/day is
V = 4500 − 400 (x / 25), and the new toll/veh would be T = 125 + x.
In order to maximize revenues, what would the new toll charge be per
vehicle and what would the traffic in veh/day be after the toll increase?
2. An individual is planning to take an 600-mile trip between two large
cities. Three possibilities exist: air, rail, or auto. The person is willing
to pay \$25 for every hour saved in making the trip. The trip by air
costs \$450 and travel time is 6 hrs, by rail the cost is \$400 and travel
time is 10 hrs, and by auto the cost is \$250 and travel time is 15 hrs.
(a) Which mode is the best choice?
(b) What factors other than cost might influence the decision
regarding which mode to use?

Chapter 3 Characteristics of the Driver, Pedestrian,

7. Thedesignspeedofamultilanehighwayis60mi/h.Determine(a)the
minimum stopping sight distance that should be provided for a level
roadway, and (b) the minimum stopping sight distance that should be

3

Note: the term a/g in the appropriate equation is typically rounded to
0.35 for calculation purposes. Assume perception reaction time = 2.5
sec.

1. The acceleration of a vehicle can be expressed as: du/dt = 3.6 – 0.06u
If the vehicle speed, u, is 30 ft/sec at time T0, Determine:
(a) Distance traveled when the vehicle has accelerated to 45 ft/sec.
(b) Time for vehicle to attain the speed of 45 ft/sec.
(c) Acceleration after 4 seconds.
2. Determine the horsepower developed by a passenger car traveling at a
speed of 50 mi/h on an upgrade of 5% with a smooth pavement. The
weight of the car is 3500 lb and the cross-sectional area of the car is
40 ft2.

10. A driver on a level two-lane highway observes a truck completely
blocking the highway. The driver was able to stop her vehicle only 30
ft from the truck. If the driver was driving at 55 mi/h, how far was she
from the truck when she first observed it (assume perception-reaction
time is 1.5 seconds)? How far was she from the truck at the moment
the brakes were applied (use a/g = 0.35)?

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