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 miltilane highway (three lanes in each direction) has a measured FFS of 70 mi/h. It is on rolling terrain with a traffic stream consisting of 17% heavy vehicles. One direction of the highway currently operates at maximum LOS C conditions, and it is known that the highway has PHF = 0.70. How many vehicles can be added to this highway (ignore capacity), assuming the proportion of vehicle types remain the same but the peak-hour factor increases to 0.89. (Note: range +/-3, round to the nearest vehicle)

The average daily traffic on a stretch of road is 300 commercial vehicles per lane per day. Design traffic repetitions for 10 years when vehicle damage factor is 2.5 and traffic growth rate is 7% is

Traffic flow on a three-lane (one direction) freeway can be described by the Greenshields model. One lane of the three lanes on a section of this freeway will have to be closed to undertake an emergency bridge repair that is expected to take 2 hours. It is estimated that the capacity at the work zone will be reduced by 35 percent of that of the section just upstream of the work zone. The mean free flow speed of the highway is 60 mi/h and the jam density is 125 veh/mi/ln. If it is estimated that the demand flow on the highway during the emergency repairs is 90 percent of the capacity, using the deterministic approach, determine the following. (a) the maximum queue length (in veh) that will be formed  Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. veh (b) the total delay (in h)  Your response differs…

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…

A suburban undivided 50 km multi-lane highway on rolling terrain has an AADT of 30,000 vehicles per day, with a peak hour factor estimated at 0.9 and the directional factor, D is estimated at 0.7. All lanes are 3.05 m wide. There are no obstructions within 1.83 m of the curb. The percentages for the various heavy vehicle types are PT – 12%, PB – 6%, PR – 2%. The highway is required to provide a Level of Service ‘B’. Assuming (refer to TRB1994) the highway is to be designed for the thirtieth highest hourly volume during the year (where K = 0.15).