An existing Class II two-lane highway is to be analyzed to determine the level of service in each direction given the following information:

Peak hourly volume in the analysis direction: 900 veh/h
Peak hourly volume in the opposing direction: 400 veh/h
Trucks: 12% of total volume
Recreational vehicles: 2% of total volume
PHF: 0.95
Lane width: 12 ft
Shoulder width: 10 ft
Access points per mile: 20
Terrain: rolling
Base free flow speed: 60 mi/h
No passing zones: 40% of analysis segment length

What will be an ideal response?


Analysis for the peak direction: 900 veh/h



Step 1: Compute passenger car equivalent flow rate for peak 15-minute period, vp

a) Main direction:

Determine fg (grade adjustment factor), using Table 9.21; fg = 1.00

Determine ETd (PCE for trucks), using Table 9.23; ETd = 1.0

Determine ERd (PCE for RVs), using Table 9.23; ERd = 1.0

Determine fHVd (heavy vehicle adjustment factor), using Equation 9.5



b) Opposite direction:

Determine fg (grade adjustment factor), using Table 9.21; fg = 0.91

Determine ETo (PCE for trucks), using Table 9.23; ETo = 1.6

Determine ERo (PCE for RVs), using Table 9.23; ERo = 1.0

Determine fHVo (heavy vehicle adjustment factor), using Equation 9.5





Step 4: LOS. Table 9.11

- PTSF = 82.99%

- LOS = D

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