Determine the PTSF and ATS of a Class I two-lane highway in rolling terrain if the grade in the peak direction is 4.75%
Posted: Thu Jul 14, 2022 3:32 pm
Determine the PTSF and ATS of a Class I two-lane highway in rolling terrain if the grade in the peak direction is 4.75% upgrade and 4.75% down grade.
Given: Difference between free-flow speed and crawl spees = 25 mi/hrVolume northbound = 1300 veh/h Volume southbound = 500 veh/hr PHF = 0.90Trucks/buses = 15% trucks of which 14% are semi-trailers and 5% RVs. Lane widths = 11 ftShoulder widths = 4 ft.Roadway section = 5 mi in lengthAccess points = 18 per mile.No-passing zones = 50%and Free-flow speed = 65 mi/hr
Given: Difference between free-flow speed and crawl spees = 25 mi/hrVolume northbound = 1300 veh/h Volume southbound = 500 veh/hr PHF = 0.90Trucks/buses = 15% trucks of which 14% are semi-trailers and 5% RVs. Lane widths = 11 ftShoulder widths = 4 ft.Roadway section = 5 mi in lengthAccess points = 18 per mile.No-passing zones = 50%and Free-flow speed = 65 mi/hr