A segment of four-lane freeway (two lanes in each direction) has a 2.5% upgrade that is 1.5 miles long. The lane width is 11.5 ft and obstructions are 4 ft from the right edge of the traveled pavement. The total ramp density (TRD) is 2 ramps per mile. The directional peak-hour volume is 2,300 vph and the peak hour factor (PHF) is 0.98. The traffic stream has 10% trucks with a mix of 50% single unit trucks (SUT) and 50% tractor trucks (TT). Assume that all the drivers are regular commuters. In order to determine the LOS for this freeway segment, answer the following questions. (a) Determine Free Flow Speed (FFS) [3 pts] (b) Find fнv. [3 pts] (c) Determine adjusted flow rate. [3 pts] (d) Find breakpoint value (BP) [3 pts) (e) Determine average passenger car speed. [3 pts] (f) Estimate Density [3 pts] (g) Determine LOS [2 pts]

A segment of four-lane freeway (two lanes in each direction) has a 2.5% upgrade that is 1.5 miles long. The lane width is 11.5 ft and obstructions are 4 ft from the right edge of the traveled pavement. The total ramp density (TRD) is 2 ramps per mile. The directional peak-hour volume is 2,300 vph and the peak hour factor (PHF) is 0.98. The traffic stream has 10% trucks with a mix of 50% single unit trucks (SUT) and 50% tractor trucks (TT). Assume that all the drivers are regular commuters. In order to determine the LOS for this freeway segment, answer the following questions. (a) Determine Free Flow Speed (FFS) [3 pts] (b) Find fнv. [3 pts] (c) Determine adjusted flow rate. [3 pts] (d) Find breakpoint value (BP) [3 pts) (e) Determine average passenger car speed. [3 pts] (f) Estimate Density [3 pts] (g) Determine LOS [2 pts]

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 8P

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