Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 13, Problem 21P
To determine
The scores for each alternative and recommendation of a preferred alternative for development.
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The Department of Traffic is considering three improvement plans for a heavily traveled intersection within the city. The intersection 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 as well as additional construction and maintenancecosts is shown in the table below. If the economic life of the road is considered to be 60 years and the discount rate is 3.5%, which alternative should be selected? Solve the problem using the four methods for economic analysis.
12) List and define the 4 steps of the "4-step travel demand model" used in transportation planning.
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…
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Traffic and Highway Engineering
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- Three designs have been proposed to improve traffic flow at a major intersection in a heavily traveled suburban area. The first alternative involves improved traffic signaling. The second alternative includes traffic-signal improvements and intersection widening for exclusive left turns. The third alternative includes extensive reconstruction, including a grade separation structure. The construction costs, as well as annual maintenance and user costs, are listed in the following table for each alternative. Determine which alternative is preferred based on economic criteria if the analysis period is 20 years and the annual interest rate is 15%. Show that the result is the same using the present worth, equivalent annual cost, benefit–cost ratio, and rate-of-return methods.arrow_forwardThree designs have been proposed to improve traffic flow at a major intersection in a heavily traveled suburban area. The first alternative involves improved traffic signaling. The second alternative includes traffic-signal improvements and intersection widening for exclusive left turns. The third alternative includes extensive reconstruction, including a grade separation structure. The construction costs, as well as annual maintenance and user costs, are listed in the following table for each alternative. Determine which alternative is preferred based on economic criteria if the analysis period is 20 years and the annual interest rate is 15%. Show that the result is the same using the present worth, equivalent annual cost, benefit–cost ratio, and rate-of-return methods. Alternatives Capital Cost ($) Annual Maintence ($) Annual User Cost ($) Salvage Value ($) Present Condition 0 15,000 600,000 0 Traffic Signal 340,000 10,000 450,000 25,000 Intersection Widening 850,000 5,000…arrow_forwardDescribe the principles of transportation system performance measurement and evaluation.arrow_forward
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- You are designing a freeway as a passenger-car only facility, and with ideal roadway characteristics. It is estimated that the freeway will have a traffic demand of 75.000 vehicles per day, a free-flow speed of 70 mi/h, a traffic stream of primarily commuters, a peak-hour factor of 0.88 and a directional distribution of 0.65. Determine the number of lanes (both directions) required to provide at least level of service D using the 30th highest annual hourly volume (K30+ 0.12). The answer is a number of lane freeway.arrow_forwardAnalysis and Planning for Transportation Policy: Summarise. Please elaborate on its significance.arrow_forwardA) Which emerging transportation modes are likely to reduce VMT in low density suburban areas, and why? B) Which emerging transportation modes are likely to reduce VMT in high density cities, and why? Please solution all partarrow_forward
- List six transportation simulation models or software systems described in the Highway Capacity Manual 2000 or elsewhere and elaborate on five (5) of these models/software systems.arrow_forwardA study showed that during the peak-hour commute on two routes connecting a suburb with a large city, there are a total of 5500 vehicles that make the trip. Route 1 is 7 miles long with a 65-mi/h speed limit and route 2 is 4 miles long with a speed limit of 50 mi/h. The study also found that the travel time on route 2 increases with the square of the number of vehicles, while the route 1 travel time increases two minutes for every 500 additional vehicles added. Determine the user-equilibrium travel time in minutes.arrow_forwardThe 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_forward
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