A multilane highway has four lanes (two lanes in each direction) and a measured free-flow speed...
A multilane highway has four lanes (two lanes in each direction) and a measured free-flow speed of 55 mi/h. One upgrade is 3% and 2 miles long. Trucks are not permitted on the highway, but there are 5% buses in the directional peak hour volume of 1900 vehicles with a peak hour factor of 0.80. What is the calculated density of the highway, assuming familiar drivers are in the traffic stream?
Homework Answers
Given,
Free Flow Speed, FFS = 55 mph
Number of lanes in each direction = 2
Peak Flow, V = 1900 veh/hr
Peak-hour factor = 0.80
No Trucks
Buses = 5 %
3% upgrade and 2 miles long
EB = 2.5
fHV = 1/ (1 + 0.05 (2.5-1)) = 1/1.075 = 0.93
fP = 1.0
Peak Flow Rate, Vp = V / (PHV*n*fHV*fP) = 1900/(0.93*2*0.80*1.0) = 1276.88 ~ 1277 veh/hr/ln
Vp < 1400
S = FFS = 55 mph
Density = Vp/S = (1277) / (55) = 23.22 veh/mi/ln
Hence Level of Service is C
Density of LOS C should lie between 18 – 26 veh/mi/ln
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