Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 19, Problem 6P
To determine
Thedeign equivalent single axel load
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A six-lane divided highway is to be designed to replace an existing highway. The present AADT (both directions)
of 6,000 vehicles is expected to grow at 5% per annum. Assume SN = 4 and pt = 2.5. The percent of traffic on the
design lane is 45%.
(a) Determine the design ESAL if the design life is 20 years and the vehicle mix is:
Passenger cars (1000 lb/axle) = 60%
2-axle single-unit trucks (5000 lb/axle) = 30%
3-axle single-unit trucks (7000 lb/axle) = 10%
(b) Based on this design ESAL, design a suitable pavement consisting of an asphalt mixture surface
with an elastic modulus of 250,000 lb/in2, a granular base layer with a structural coefficient of 0.14, and a
granular subbase layer with a structural coefficient of 0.09 on a subgrade having a CBR of 10. Assume all mi
values = 1. Use a reliability level of 85%, a standard deviation of 0.45, and a design serviceability loss of 2.0
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%
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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- 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 annum. Assume SN = 4 and pt = 2.5. The percent of traffic on the design lane is 45%. a. Determine the design ESAL if the design life is 20 years and the vehicle mix is: Passenger cars (1000 lb/axle) = 60% 2-axle single-unit trucks (5000 lb/axle) = 30% 3-axle single-unit trucks (7000 lb/axle) = 10% b. Design a suitable pavement consisting of an asphalt mixture surface with an elastic modulus of 250,000 lb/in2, a granular base layer with a structural coefficient of 0.14 on a subgrade having a CBR of 10. Assume all mi values = 1. Use a reliability level of 85%, a standard deviation of 0.45, and a design serviceability loss of 2.0.arrow_forwardThe predicted traffic mix of a proposed four-lane urban non-interstate freeway is as follows. Passenger cars = 78% Single-unit trucks: 2-axle, 5,000 lb/axle = 12% 2-axle, 9,000 lb/axle = 4% 3-axle or more, 23,000 lb/axle = 3% Tractor semitrailers and combinations: 3-axle, 20,000 lb/axle = 3% The projected AADT during the first year of operation is 3,900 (both directions). If the traffic growth rate is estimated at 3 percent and the CBR of the subgrade is 7.5, determine the depth of a full- asphalt pavement (in inches) using the AASHTO method and n = 20 years. The resilient modulus of the asphalt (EAC) is 320,000 lb/in². Assume m, for the subgrade is 1 and the percent of traffic on the design lane is 42 percent, p₁ = 2.5, and SN = 4. Use a reliability level of 90 percent, a standard deviation of 0.45, and a design serviceability loss of 2.0. Assume the design lane factor f is 0.42. (Use single-axle load equivalency factors for 2-axle vehicles and tandem-axle load equivalency factors for…arrow_forwardThe predicted traffic mix of a proposed four-lane urban non-interstate freeway is as follows. Passenger cars = 78% Single-unit trucks: 2-axle, 5,000 lb/axle = 12% 2-axle, 9,000 lb/axle = 4% 3-axle or more, 23,000 lb/axle = 3% Tractor semitrailers and combinations: 3-axle, 20,000 lb/axle = 3% The projected AADT during the first year of operation is 3,900 (both directions). If the traffic growth rate is estimated at 3 percent and the CBR of the subgrade is 7.5, determine the depth of a full-asphalt pavement (in inches) using the AASHTO method and n = 20 years. The resilient modulus of the asphalt (EAC) is 320,000 lb/in². Assume m, for the subgrade is 1 and the percent of traffic on the design lane is 42 percent, pt = 2.5, and SN = 4. Use a reliability level of 90 percent, a standard deviation of 0.45, and a design serviceability loss of 2.0. Assume the design lane factor f is 0.42. (Use single-axle load equivalency factors for 2-axle vehicles and tandem-axle load equivalency factors for…arrow_forward
- The predicted traffic mix of a proposed four-lane urban non-interstate freeway is as follows. Passenger cars = 78% Single-unit trucks: 2-axle, 5,000 lb/axle = 12% 2-axle, 9,000 lb/axle = 4% 3-axle or more, 23,000 lb/axle = 3% Tractor semitrailers and combinations: 3-axle, 20,000 lb/axle = 3% The projected AADT during the first year of operation is 3,900 (both directions). If the traffic growth rate is estimated at 3 percent and the CBR of the subgrade is 7.5, determine the depth of a full-asphalt pavement (in inches) using the AASHTO method and n = 20 years. The resilient modulus of the asphalt (EAC) is 320,000 lb/in2. Assume mi for the subgrade is 1 and the percent of traffic on the design lane is 42 percent, pt = 2.5, and SN = 4. Use a reliability level of 90 percent, a standard deviation of 0.45, and a design serviceability loss of 2.0. Assume the design lane factor fd is 0.42. (Use single-axle load equivalency factors for 2-axle vehicles and tandem-axle load equivalency…arrow_forwardA 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 annum. 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 (1000 lb/axle) =60% 2-axle single-unit trucks (5000 lb/axle) =30% 3-axle single-unit trucks (7000 lb/axle) =10%arrow_forwardA 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 annum. Assume SN = 4 and pt = 2.5. The percent of traffic on the design lane is 45%. The design life is 20 years and the vehicle mix is: Passenger cars (1000 lb/axle) = 60% 2-axle single-unit trucks (5000 lb/axle) = 30% 3-axle single-unit trucks (7000 lb/axle) = 10% Design a suitable pavement consisting of an asphalt mixture surface with an elastic modulus of 250,000 lb/in2, a granular base layer with a structural coefficient of 0.14 on a subgrade having a CBR of 10. Assume all mi values = 1. Use a reliability level of 85%, a standard deviation of 0.45, and a design serviceability loss of 2.0.arrow_forward
- The predicted traffic mix of a proposed four lane urban non-interstate freeway: Passenger cars (4.44kN/axle) = 69% 2-axle single unit trucks (22.2kN/axle) = 20% 2-axle single unit trucks (40kN/axle) = 5% 3-axle or more single unit trucks (100KN/axle) = 4% 3-axle or tractor semitrailers and combinations (90kN/axle) = 2% The projected AADT during the first year of operation is 3500 (both directions). If traffic growth rate is estimated at 4%, percent of traffic on the design lane is 42%, pi =2.5 and SN =3, determine the design ESAL at the design life of 20 years.arrow_forwardThe predicted traffic mix of a proposed four lane urban non-interstate freeway: Passenger cars (4.44KN/axle) = 69% 2-axle single unit trucks (22.2kN/axle) = 20% 2-axle single unit trucks (40KN/axle) = 5% 3-axle or more single unit trucks (100KN/axle) = 4% 3-axle or tractor semitrailers and combinations (90kN/axle) = 2% %3D %3D %3D The projected AADT during the first year of operation is 3500 (both directions). If traffic growth rate is estimated at 4%, percent of traffic on the design lane is 42%, pt =2.5 and SN =3, determine the design ESAL at the design life of 20 years.arrow_forwardThe predicted traffic mix of a proposed four-lane urban non-interstate freeway: Passenger cars (4.44kN/axle) = 65% 2-axle single unit trucks (22.2kN/axle) = 24% 2-axle single unit trucks (40kN/axle) = 6% 3-axle or more single-unit trucks (100kN/axle) = 3% 3-axle or tractor semitrailers and combinations (90kN/axle) = 2% The projected AADT during the first year of operation is 4000 (in both directions). If the traffic growth rate is estimated at 4%, the percent of the traffic on the design lane is 43%, pt =2.5, and SN =3, calculate the design ESAL at the design life of 25 years.arrow_forward
- Current truck traffic volumes (in AADTT) for a six-lane highway are shown in the table below. An asphalt pavement with a 20 year design life is to be designed according to the Hveem method. It is assumed that traffic volumes for each truck classification will grow linearly by 20 percent over the next 20 years. Current traffic Expanded Vehicle Type ESAL constant 20 year ESAL volume (AADTT) Volume 2-axle trucks 500 3-axle trucks 300 4-axle trucks 150 5-axle or more trucks 750 Totalarrow_forwardPlease solve this question in step by step in hand- It is transportation-2 Civil engineering Question-4 An six-lane divided highway is to be constructed on a new alignment. Traffic volume forecasts indicate that the average annual daily traffic (AADT) during the first year of operation will be (14002), with the following vehicle mix and axle loads (single axles). Passenger cars (2000 lb/axle) = 60% 2-axle single unit trucks (8000 lb/axle) = 25% 4-axle trucks (12000 1b/axle) = 15% If the expected annual traffic growth rate is 3.5 percent for all vehicles, estimate the design ESAL, given a design period of 18 years using axle load equivalency factor (LEF) tables.arrow_forward8. A two-lane highway is expected to serve ADT of 5000 veh, find DHV and DDHV in veh and pcu if the following information is given: K=0.1, D=0.6 Traffic composition includes 80 passenger cars and 20% trucks.arrow_forward
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