A 10-mile segment of rural freeway carries an average annual daily traffic


(AADT) of 40,000 veh/day, where 10% of the traffic is trucks and the rest, cars.

The current alignment, which has many grades, vertical curves, and horizontal

curves allows traffic to maintain an average speed of 45 mi/h. A plan has been

developed to provide for an improved alignment that will reduce the length of the

segment to 8 miles, and increase average speeds to 60 mi/h. What savings in vehicle

operating and maintenance costs and travel time costs will the improvement

produce? The average wage is $22.80 for the area for general users, and $35.00/hr

for commercial vehicle drivers. Average auto occupancy is 1.3 people per car.