Traffic And Highway Engineering
5th Edition
ISBN: 9781133605157
Author: Garber, Nicholas J., Hoel, Lester A.
Publisher: Cengage Learning,
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Chapter 13, Problem 4P
To determine
(a)
The net user benefits per year.
To determine
(b)
The comparison of calculated value with that of typical highway studies
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Consideration is being given to increasing the toll on a bridge now carrying
4500 veh/day. The current toll is $1.35/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 iš 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 = 135 + 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?
Q2: a. Show how to determine the number of lanes for a rural highway required to
serve a current volume 5000 veh/day. The following data are to be used: annual
growth rate = 4%, design and construction period = 22 years, percent of trucks =
10 (pc equivalent factor = 2), design capacity of lane = 900 pc/hr/lane and the
directional distribution factor = 75%.
For this exercise, you are to design a roadway that is to carry 100,000 people a day (excluding
truck occupants) – 50,000 in design direction. The vehicles that carry these people include; (1)
personal vehicles (average occupancy of 1.2 people per car) 2-2 kip single axles, and (2) buses
with 2-22 kip single axles (assume they are filled with an average of 40 passengers). There are
also trucks on the roadway and all trucks have 1-40 kip triple axle, 1-32 kip tandem axle, and 1-8
kip single axle. You know that the soil CBR is 6, the initial PSI is 4.5 and the TSI is 2.5. Other
values to be used:
All drainage coefficients = 1.0
Reliability = 90%
Overall standard deviation of traffic = 0.50
Concrete Modulus of Elasticity = 5.5 million lb/in2
Concrete Modulus of Rupture = 750 lb/in2
PCC load transfer coefficient = 3.0
Design a rigid and flexible pavement, to last 15 years, for a four-lane road (four lanes in design
direction) with 400 trucks per day in the design direction, and…
Chapter 13 Solutions
Traffic And Highway Engineering
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- A toll bridge carries 10,000 veh/day. The current toll is $3.00/vehicle. Studies have shown that for each increase in toll of 50 cents, the traffic volume will decrease by 1000 veh/day. It is desired to increase the toll to a point where revenue will be maximized. Let V be the Volume X be the increase in toll charge (a) Write the expression for travel demand on the bridge related to toll increase and current volume. (b) Determine the increase in toll charge (c) Determine the new toll charge to maximize revenues. (d) Determine traffic in veh/day after toll increase. (e) Determine total revenue increase with new toll.arrow_forwardTwo routes connect a city and suburb. During the peak-hour morning commute, a total of 5000 vehicles travel from the suburb to the city. Route 1 has a 50km/hr speed limit and 5km in length, Route 2 has a 55km/hr speed limit and 4 km in length. Studies show that the total travel time on route 1 increases 2 mins for every extra 500 vehicles added. Mins of travel time on route 2 increase with the square of the no. of vehicles expressed in 000’s. Determine user equilibrium travel times.arrow_forwardTwo routes connect an origin and destination with performance function t; = aj + (xj/cj)2 (with t's in minutes and x's in thousands of vehicles per hour). It is known that at user equilibrium, 65% of the origin-destination demand takes route 1. How many vehicles (in thousands) will take route 1 if system optimal equilibrium is archived? Route 1 Route 2 a 7 2 3arrow_forward
- The Department of Traffic is considering three improvement plans for a heavily traveled road within the city. The road improvement is expected to achieve three goals: improve travel speeds, increase safety, and reduce operating expenses for motorists. The annual dollar value of savings compared with existing conditions for each criterion and additional construction and maintenance costs is shown in Table 1. If the economic life of the road is considered to be 53 years and the discount rate is 4%, which alternative should be selected? Evaluate the two proposals based on economic evaluation criteria using the Net Present Worth (NPW) and benefit-cost ratio (BCR) methods for economic analysis.arrow_forwardThe daily counts of the current traffic volume for a rural highway for one week of May 2000 are as shown in the following table: Sat. Sun. Mon. Tues. Wed. Thur. Fri. Day Daily volume 12000 12500 10500 11500 9500 9000 8500 The traffic is composed of 70% passenger car, 20% bus, 10% truck. The percent of future traffic to current traffic is predicted to be 180% up to May 2020. Determine the required number of lanes for this highway if the lane capacity is 1300 pc/hr.arrow_forwardUSE THE PROBLEM STATEMENT BELOW TO ANSWER THE FOLLOWONG QUESTIONS Three routes connect an origin and destination with performance functions t₁ = 2 + 0.5x1, t2 =1+x2 and t3 = 4 + 0.2x3 (with t's in minutes and x's in thousands of vehicles per hour). Determine user-equilibrium flows if the total origin-to-destination demand is a) 10,000 veh/h and b) 5000 veh/h. Part a: use demand 10,000 veh/h Are all routes used? Make sure to show all logic explaining your reasoning in the PDF submission. O Yes O No Determine the traffic flow on route 1 in vehicles per hour. Round answer to nearest WHOLE number. Determine the traffic flow on route 2 in vehicles per hour. Round answer to nearest WHOLE number.arrow_forward
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