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 avement (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 i 2 percent, p, 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 3-axle vehicles.) inches

On a specific westbound section of a highway, studies show that the speed density relationship is [1-(+)"] 4.5 k U = u k It is known that the capacity is 4500vph and the jam density is 270 veh/km. Speed at the capacity 24.23 24.34 O 24.53 O 24.87

: The data shown below were obtained on a highway determine the value of "a" and "b" given the formula for Greenshield's Model. Also determine the maximum capacity and the jam density, optimum speed and density density, vpkm speed, kph 50 18 45 25 40 41 34 58 22 71 13 88 12 98 10 105 9. 110 8 125 135

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 theAADT (both directions) during the first year of operation is 24,000 with the followingvehicle mix and axle loads.Passenger cars 50%2-axle single-unit trucks (12,000 lb/axle) 40%3-axle single-unit trucks (16,000 lb/axle) 10%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 AASHTOdesign procedure, determine the minimum depth of concrete pavement required forthe design period of 20 years.R 95%So 0.3Cd 1.0J 3.2k 130Ec 5  106lb>in.2S¿c 650 lb>in.2Pt 2.5Pi 4.5

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