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calculation steps of level of service for multi lane ways

calculation steps of level of service for multi lane ways

Engineering   Civil-Engineering   
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Answer #1

Solution:

step-1 First calculate FFS(free flow speed)

  

   Here,
BFFS = base free-flow speed, 70 mph (urban), 75 mph (rural)
fLW = adjustment for lane width (mph)
fLC = adjustment for right-shoulder lateral clearance (mph)
fN = adjustment for number of lanes (mph)
fID = adjustment for interchange density (mph)

step-2 Then determine the Flow Rate

Here,

vp = 15-minute passenger-car equivalent flow rate
V = hourly volume (veh/hr),
PHF = peak hour factor
N = number of lanes in one direction
fHV heavy-vehicle adjustment factor
fP = driver population adjustment factor

step-3 Then find the LOS corresponding to calculated vp and FFS using chart of Criteria for Basic Freeway Segments
(You can find the chart from highway capacity manual of your country).

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