Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 19, Problem 9P
To determine
The vehicle mix of the design ESAL for the design life of 20years.
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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 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…
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 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…
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…
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- 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) = 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_forwardThe predicted traffic mix of a proposed 4-lane urban non-interstate freeway is: Passenger cars = 78%Single Unit Trucks:2-axle 22.2 kN/axle =12%2-axle 39.9 kN/axle =4%3-axle or more 102 kN/axle =3% Tractor semitrailers and combinations: 3-axle 88.8kN/axle = 3%The projected AADT during the first year of operation is 3900 (both directions). If the traffic growth rate is 3%, and CBR of the subgrade is 7.5%, determine the depth of a full-asphalt pavement using the AASHTO (1993) method and design life of the pavement is 20 years. The resilient modulus of asphalt is 2206 MPa. Assume the mi of subgrade is 1, and percent of traffic on the design line is 42%. Initial serviceability index is 4.5, terminal present serviceability index is 2.5, and SN=4. Use a reliability of 90%, a standard deviation of 0.45.NOTE: All the steps that are followed during the design must be shown and explained clearly. Only number without explanations will not get any credit.arrow_forward
- 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%arrow_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_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 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%arrow_forward
- 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. Passenger cars = 50 percent 2-axle single-unit trucks (12,000 lb/axle) = 40 percent 3-axle single-unit trucks (16,000 lb/axle) = 10 percent 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. design period of 20 years. Pi = 4.5 J = 3.2 Pt = 2.5 Cd = 1.0 S'c = 650 lb/in2 So = 0.3 Ec = 5 × 106 lb/in2 R = 95% k = 130 lb/in3 pavement containing doweled joints, 6 inch untreated subbase, and concrete shoulders determine the minimum depth of concrete pavement required using the PCA design method.arrow_forwardAn 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. Passenger cars = 50 percent 2-axle single-unit trucks (12,000 lb/axle) = 40 percent 3-axle single-unit trucks (16,000 lb/axle) = 10 percent 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.arrow_forwardAn 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. Passenger cars = 50 percent 2-axle single-unit trucks (12,000 lb/axle) = 40 percent 3-axle single-unit trucks (16,000 lb/axle) = 10 percent 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. a. Using the AASHTO design procedure, determine the minimum depth of concrete pavement required for the design period of 20 years. Pi = 4.5 J = 3.2 Pt = 2.5 Cd = 1.0 S'c = 650 lb/in2 So = 0.3 Ec = 5 × 106 lb/in2 R = 95% k = 130 lb/in3 b. Repeat the problem for a pavement containing doweled joints, 6 inch untreated subbase, and concrete shoulders, using the…arrow_forward
- 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 2.0arrow_forwardGiven the data below: Daily Traffic Count Axle Load (Kips) 1000 (single axle cars) 300 (single axle buses) 120 (tandem axle trucks) 100 (tandem axle trucks) 50 (triple axle trucks) 22 40 50 50 SN is 5, P = 4.2, P; = 3, design life is 20 years, growth rate is 5%, lane distribution factor = 0.45 EASL Calculate the !arrow_forward4.7 PROBLEMS 4.7.3 Axle load study conducted on a stretch of road in 2017 yield theşe results: Axle load range (ton) 2 - 4 4 - 6 6 -8 8 - 10 10 - 12 12 – 14 No. of axle 500 710 599 621 452 168 Number of commercial vehicles for the particular day is 1860. Based on Road Note 31, determine: a) Average number of axle per commercial vehicle; b) Total equivalent standard axle for that particular day; c) Average number of standard axle per commercial vehicle; and d) Average number of standard axle per commercial axle.arrow_forward
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