During the peak hour on a Class I two-lane highway in rolling terrain, volume northbound(peak direction) are 1300 veh/h and volume southbound are 500 veh/h. The PHF is 0.90, and there are 15% trucks/buses of which 14% are semi-trailers and 5% RVs. Lane widths are 11 ft, and shoulder widths are 4 ft. The roadway section is 5 mi in length, and there are 18 access points per mile. There are 50% no-passing zones and the free-flow speed is 65 mi/h. Determine the PTSF and ATS if the grade in the peak direction is 4.75% upgrade and if it is 4.75% down grade. The difference between free-flow speed and crawl speed is 25 mi/h.

During the peak hour on a Class I two-lane highway in rolling terrain, volume northbound(peak direction) are 1300 veh/h and volume southbound are 500 veh/h. The PHF is 0.90, and there are 15% trucks/buses of which 14% are semi-trailers and 5% RVs. Lane widths are 11 ft, and shoulder widths are 4 ft. The roadway section is 5 mi in length, and there are 18 access points per mile. There are 50% no-passing zones and the free-flow speed is 65 mi/h. Determine the PTSF and ATS if the grade in the peak direction is 4.75% upgrade and if it is 4.75% down grade. The difference between free-flow speed and crawl speed is 25 mi/h.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter9: Capacity And Level Of Service For Highway Segments

Section: Chapter Questions

Problem 7P

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