MULTILANE HIGHWAY CAPACITY ANALYSIS EXAMPLE A 1.57-km segment of an east-west five-lane highway with two travel lanes in each direction is separated by a two-way right-turn lane (TWRTL). Given, -
Rolling terrain, 83.0-km/h 85th-percentile speed, 3.6-m lane width, 1,500-veh/h peak-hour volume, 6 percent trucks and buses, 8 access points/km (westbound), 6 access points/km (eastbound), 0.90 PHF, 3.6-m and greater lateral clearance for westbound and eastbound
What is the LOS of the highway on level terrain during the peak hour? Solution BFFS = 83.0 – 3.0 = 80.0 km/h Eastbound fLW = 0.0 (from Table 2.1) fLC = 0.0 (from Table 2.2) fM = 0.0 (from Table 2.3) fA = 4.0 (from Table 2.4) FFS = BFFS – fLW – fLC – fM – fA = 80.0 – 0.0 – 0.0 – 0.0 – 4.0 = 76.0 km/h PT = 0.06 ET = 2.5 (from Table 2.5) 1 1 fhv = = = 0.9174 1 PT (E T 1) 1 0.06(2.5 1) fp = 1.0 (assuming all are regular drivers) V = 1,500 PHF = 0.90 N=2
BDD/UTHM/2015
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BFC 30302
vp =
V 1,500 = = 909 pc/h/ln PHF N fHV fp 0.90 2 0.9174 1.0
Density =
vp S
=
909 = 12.0 pc/km/ln 76
LOS LOS C (using Figure 2.3)
Westbound fLW = 0.0 (from Table 2.1) fLC = 0.0 (from Table 2.2) fM = 0.0 (from Table 2.3) fA = 5.3 (from Table 2.4) FFS = BFFS – fLW – fLC – fM – fA = 80.0 – 0.0 – 0.0 – 0.0 – 5.3 = 74.7 km/h PT = 0.06 ET = 2.5 (from Table 2.5) 1 1 fhv = = = 0.9174 1 PT (E T 1) 1 0.06(2.5 1) fp = 1.0 (assuming all are regular drivers) V = 1,500 PHF = 0.90 N=2 vp =
V 1,500 = = 909 pc/h/ln PHF N fHV fp 0.90 2 0.9174 1.0
Density =
vp S
=
909 = 12.2 pc/km/ln 74.7
LOS LOS C (using Figure 2.3)
BDD/UTHM/2015
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BFC 30302
Table 2.1
Table 2.2
Adjustment for Lateral Clearance
Table 2.3
Table 2.4
BDD/UTHM/2015
Adjustment for Lane Width
Adjustment for Median Type
Adjustment for Access Point Density
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BFC 30302
Table 2.5
Passenger Car Equivalents on Extended General Highway Segments
Table 2.6
Passenger Car Equivalents for Trucks and Buses on Uniform Upgrades
BDD/UTHM/2015
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BFC 30302
Table 2.7
Passenger Car Equivalents for Trucks and Buses on Downgrades
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