A six-lane divided highway is to be designed to replace an existing highway. The present AADT (both directions) of 5,100 vehicles is expected to grow at 5 percent per annum. Assume SN = 4 and p₂ = 2.5. Th 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 negligible. Use single-axle load equivalency factors for 2-axle and 3-axle trucks.) Passenger cars (1,000 lb/axle) = 55% 2-axle single-unit trucks (5,000 lb/axle) = 27% 3-axle single-unit trucks (7,000 lb/axle) = 18% Total ESAL =

A six-lane divided highway is to be designed to replace an existing highway. The present AADT (both directions) of 5,100 vehicles is expected to grow at 5 percent per annum. Assume SN = 4 and p₂ = 2.5. Th 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 negligible. Use single-axle load equivalency factors for 2-axle and 3-axle trucks.) Passenger cars (1,000 lb/axle) = 55% 2-axle single-unit trucks (5,000 lb/axle) = 27% 3-axle single-unit trucks (7,000 lb/axle) = 18% Total ESAL =

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter6: Fundamental Principles Of Traffic Flow

Section: Chapter Questions

Problem 25P

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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 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 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
8. 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.
One segment of a two-lane, two-way rural highway is on rolling terrain and currently operates at maximum level of service C conditions. The annual growth rate of traffic on this segment of road is about 5%, and studies shown that it will continue to grow at this rate for the rest of this decade. Assuming a K factor (design hour factor) for this segment of road 0.13, determine in how many years will the number of lanes have to be increased if the level of service must not be worse than D?
Design data is required for the improvement of two-way highway with present AADT is (2500 veh./day) in both directions. The improved road with a design life of (25 years), annual growth rate of traffic is (7%) and construction period is (6 years), (K=11%), (D=60%). Calculate the Design Hour Volume (DHV):- * DHV = 1344 DHV = 1322 DHV = 1422 DHV = 1433 DHV = 1354
/ a. A eight lane ( Both direction) highway which opened to traffic at 2019. Truck and busses percent 10,and 20 respectively , ideal capacity 1100 pcu/day/lane . Determine the average daily traffic at 2009(vpd) when the data was collected (K – factor 10% , D = 70% and n =20 years)
If Vf = 2327 VPH with 9% trucks, VR1 = 653 VPH with 5% trucks, and VR2 = 594 VPH with 8% trucks, what is the passenger car equivalents (Vpcph) of the onramp? Assume that the roadway is urban.
A 30 Km length highway is intended to be designed through a rural area as a principal arterial. The current daily volume is 7500 pd in both directions. The design life for this highway is 20 years and the construction period is years. The growth factor is 6%. Calculate the future ADT.
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 Total
Highway
: An existing rural four-lane highway is to be replaced by a six-lane divided expressway (three 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 (2,000 lb/axle) = 50% & Axle load equivalency factor is 0.0002 2-axle single-unit trucks (12,000 lb/axle) = 40% & Axle load equivalency factor is 0.174 3-axle single-unit trucks (16,000 lb/axle) = 10% & Axle load equivalency factor is 0.603 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% annually. Using the PCA design method, if the subgrade k value is 50 lb/in3 and a 6 in. stabilized subbase is used. The modulus of rupture of the concrete is 600 lb/in2 and the pavement has aggregate interlock joints (that is, no dowels) and a concrete shoulder. Determine the minimum depth of concrete pavement…
Given 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 !