A 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.

A 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.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter19: Design Of Flexible Highway Pavements

Section: Chapter Questions

Problem 8P

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A 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%
A six lane divided highway is to be designed to replace an existing highway. The present AADT (both directions) of 6000 vehicles is expected to grow at 5% per year. Assume SN = 4 and pt = 2.5. The percent of traffic on the design lane is 45%. Determine the design ESAL if the design life is 20 years and the vehicle mix is:Passenger cars (4.44kN/axle) = 60%2-axle single unit trucks (22.2kN/axle) = 30%3-axle single unit trucks (31.11kN/axle) = 10%
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