An existing Class I two-lane highway is to be analyzed to determine the level of service in each direction, given the following information:
Traffic data:
PHV = 600 veh/h
60% in the peak direction
8% trucks
2% recreational vehicles
PHF = 0.86
No passing zones: 40%
Geometric data:
Rolling terrain
BFFS = 55 mi/h
Lane width = 11 ft
Shoulder width = 2 ft
8 access points per mile
What will be an ideal response?
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 = 0.91
Determine ETd (PCE for trucks), using Table 9.23; ETd = 1.6
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 = 0.84
Determine ETo (PCE for trucks), using Table 9.23; ETo = 1.7
Determine ERo (PCE for RVs), using Table 9.23; ERo = 1.0
Determine fHVo (heavy vehicle adjustment factor), using Equation 9.5
Step 2: Compute base percent time spent following, BPTSF, using Equation 9.17.
coefficients a and b from Table 9.26.
Step 3: Compute percent time spent following, PTSF, using Equation 9.16
Step 4: Equation 9.9, estimate free flow speed. Adjustment coefficients fLS and fA
from Tables 9.12 and 9.13, respectively.
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