An existing rural freeway in rolling terrain is to be analyzed to determine LOS using the following information: number of lanes in each direction equals 2, peak hour volume of 2640 veh/h (in the peak direction), 18% trucks, 2% recreational vehicles, PHF = 0.91, lane width = 12 ft, lateral clearance = 10 ft, average interchange spacing is 3 mi; all interchanges are diamond interchanges.
What will be an ideal response?
Step 1: Compute demand flow rate under equivalent base conditions using
Equation 9.4
Determine fp (driver population factor); assume mainly commuter traffic, fp = 1.0
Determine ET (PCE for trucks), using Table 9.3; ET = 2.5
Determine ER (PCE for RVs), using Table 9.3; ER = 2.0
Determine fHV (heavy vehicle adjustment factor), using Equation 9.5
Step 3: Compute average passenger car speed and density to determine LOS. For
FFS = 74.13 mi/h, greater than 72.5 and less than 77.5, the 75 mi/h speed-flow
curve will be used for this analysis. It was calculated that vp = 1871 pc/h/ln.
Using Figure 9.3a, this density corresponds to LOS D.
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PROBLEM 3.93
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