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An existing rural 4-lane highway is to be replaced by a 6-lane divided expressway (3 lanes in each direction). Traffic volume data on the highway indicate that the AADT (both directions) during the first year of operation is 24,000 with the following vehicle mix and axle loads.
2-axle single-unit trucks
3-axle single-unit trucks
The vehicle mix is expected to remain the same throughout the design life of 20 years, although traffic is expected to grow at a rate of 3.5 percent annually. Using the AASHTO design procedure, determine the minimum depth of concrete pavement required for the design period of 20 years.
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Chapter 20 Solutions
Traffic and Highway Engineering
- A 25 km long, 8.001 km wide, 2-lane highway is to be paved with 6.00cm thick layer of asphalt.A fleet of 4 dump trucks are to be employed each with an empty mass of 22metric tons and a carrying capacity of 26 cubic metres. Asphalt with a density of 2.322g/m^3 will be used. Determine a) The number of dump truck loads required b) If it takes 4 hours for each truck to deliver a load, how long in day and hours will it take the trucks to deliver all the asphalt? C) The gross mass of each truck.arrow_forwardDesign is required for a new pavement to be constructed in 2010. The annual average daily traffic for commercial vehicles on the opening day will be 2000. Growth rate = 4% Design Life = 20 years Design is required for a new pavement to be constructed in 2010. The annual average daily traffic for commercial vehicles on the opening day will be 2000. Growth rate = 4% Design Life = 20 years Solve for the design traffic in msaarrow_forwardA six-lane divided highway is to be designed to replace an existing highway. The present AADT (both directions) of 5,300 vehicles is expected to grow at 5 percent per annum. Assume SN = 4 and pt = 2.5. The percent of traffic on the design lane is 45 percent. Determine the design ESAL if the design life is 20 years and the vehicle mix is as follows. (Assume the contribution of passenger car traffic to the total ESAL is negligible. Use single-axle load equivalency factors for 2-axle and 3-axle trucks.) Passenger cars (1,000 lb/axle)=59%2-axle single-unit trucks (5,000 lb/axle)=25%3-axle single-unit trucks (7,000 lb/axle)=16%arrow_forward
- Choose the right answer a rural highway on a level terrain has the following traffic composition: 40 % Passenger cars 30 % trucks 20 % buses 10 % recreational vehicles Find the total volume expressed as pcu/hr. if the total volume is 6000 veh/hr. * a-7620 b-7630 c-7640arrow_forwardA six-lane divided highway is to be designed to replace an existing highway. The present AADT (both directions) of 5,700 vehicles is expected to grow at 5 percent per annum. Assume SN = 4 and pt = 2.5. The percent of traffic on the design lane is 45 percent. Determine the design ESAL if the design life is 20 years and the vehicle mix is as follows. (Assume the contribution of passenger car traffic to the total ESAL is negligible. Use single-axle load equivalency factors for 2-axle and 3-axle trucks.) Passenger cars (1,000 lb/axle) = 64% 2-axle single-unit trucks (5,000 lb/axle) = 27% 3-axle single-unit trucks (7,000 lb/axle) = 9% Total ESAL =arrow_forwardPlease solve this question. Subject: Transportation engineering Fillet Radius Problem (Airport Engineering) Determine the minimum lead-in and the radius of the fillet (and compare with recommended values) to maintain the cockpit over the centerline for an aircraft with a 110.3 ft wingspan, a wheelbase of 40.5 ft, undercarriage width of 25.5 ft, and the distance between the main undercarriage and cockpit equal to 50.4 ft. The aircraft is moving between two parallel taxiways through a connecting taxiway which has a centerline perpendicular to the parallel taxiway. With a wingspan of 110.3 ft this aircraft is in airplane design group III (see table 6- 2). From Table 6-23 and Table 6-18, the taxiway width is 50 ft, the minimum safety margin is 10 ft, the recommended centerline radius is 100 ft.arrow_forward
- Describe in detail the phases or stages involved in the Wilson approach, and discuss the activities that take place within each phase.arrow_forwardA road can be paved with either asphalt or concrete. Concrete costs $15,000/km and lasts 20 years. What is the maximum that should be spent on asphalt if it only lasts 10 years? Annual maintenance costs for both pavements are $500/km. MARR = 12%. Demonstrate through real life examples a bridge management software you know.arrow_forwardOn a two-lane road, the lane width is 3.2 m, and the shoulder widths on both sides of the road are 1 m. In a horizontal curve with a radius of 500 m, a direct speed will be formed according to the project speed Vp = 90 km / h; According to this information, answer the following questions. a- Calculate the maximum value (dmax) in the frog (%). b- Determine the Ld speed application length (m) Note : please answer both a and b... Please give me both answer... Thank youarrow_forward
- On a two-lane road, the lane width is 3.2 m, and the shoulder widths on both sides of the road are 1 m. In a horizontal curve with a radius of 500 m, a direct speed will be formed according to the project speed Vp = 90 km / h; According to this information, answer the following questions. a- Calculate the maximum value (dmax) in the frog (%). b- Determine the Ld speed application length (m) Note : please answer both a and b... Please give me both answer..arrow_forwardA road of two lanes divided by a central island is at presem carrying a traffic of 1000 vehicles per day. This traffic is 80% cars and 20% trucks and their damage factors are 0.04 and 2 respectively For the design life of 15 years. the expected anual growth rate of traffic is 5.5%. Given the subgrade soil stiffness (Mg) is 7500 psi. Required a) Calculate the cumulative equivalent single axle load (ESAL) to be used in designarrow_forwardThe driver of an automobile travelling with a velocity of 90 km/h overtakes a bus travelling with a velocity of 70 km/h on an ungraded highway section. As the driver finishes the overtake manouevre, recognizes an obstacle and pushes down the brake pedal, only to be able to stop at a distance of 1 m to the obstacle.a) What is the distance between the automobile and the obstacle in the beginning of the overtake manouevre ?b) Determine whether the bus crashes with the automobile from behind after the automobile stops suddently after the overtake manouevre or not.Given: di=7+0,2.Vi; pavement sliding friction coefficient, f=0,40; for both drivers tr=2 sn.arrow_forward
- Traffic and Highway EngineeringCivil EngineeringISBN:9781305156241Author:Garber, Nicholas J.Publisher:Cengage Learning