Traffic And Highway Engineering
5th Edition
ISBN: 9781133605157
Author: Garber, Nicholas J., Hoel, Lester A.
Publisher: Cengage Learning,
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Chapter 17, Problem 5P
To determine
(a)
Bulk density of the soil
To determine
(b)
Dry density of the soil
To determine
(c)
Void ratio of the soil
To determine
(d)
Porosity of the soil
To determine
(e)
Degree of saturation of the soil
To determine
(f)
Volume occupied by the water in the soil
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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 + b₁×₁ ; t₂
b2x2). Determine under what condition (e.g. a relationship among the parameters of the
performance functions) tolling cannot reduce the total travel time of the two routes.
a2+
For the soil system presented below, calculate and draw diagrams of distributions of the totaland effective stresses and pore water pressure. Assume an upward water flow with a velocity of0.000,001 cm/s.
Refer to attached problem.
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- Assuming that the whole DMV is only handled by one queue and one server and both the arrival rate (20 customer per hour) and the service rate (30 customers per hour) random variables are Markovian. (a) What is the mean queue length? [3 pts] (b) Percentage of Idle time of the server? [3 pts] (c) Average number in the queue? [3 pts] (d) Average number in the system? [3 pts] (e) The average wait time in the queue? [3 pts] (f) The average wait time in the system? [3 pts] (g) The probability that no one is in the system. [2 pts]arrow_forwardA toll booth on the Thruway experiences an average inter-arrival time of 3 minutes between each vehicle. As an operator, you want to have a mean queue length of at most 2 vehicles. What mean service rate (per hour) will the toll booth need to provide?arrow_forwardA freeway is to be designed at a location on level terrain for an annual average daily traffic (AADT) of 45,000 vehicles per day. For a conversion of AADT to an annual hourly volume, assume that the K-factor is 0.10 (i.e., the 30th highest hourly volume of the year). In addition, 55% of the peak-hour traffic volume is expected to travel in the peak direction (D = 0.55). This freeway segment will be for regular commuters. Other estimates include: PHF of 0.95, free-flow speed of 65 mph, and 20% trucks of the traffic stream. In order to determine the number of lanes required to provide at least LOS C, answer the following questions. (a) Determine Free Flow Speed (FFS) [4 pts] (b) Find the directional design-hour volume (DDHV) [4 pts] (c) Find fHv [4 pts] (d) Determine the number of lanes required. [4 pts] (e) Check the expected LOS for 2-directional lanes on this freeway segment. [4 pts]arrow_forward
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