Chapter 6 _2_

# Chapter 6 _2_ - Multilane Freeway-Capacity and LOS ECI 161...

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ECI 161 Winter 2012 Multilane Freeway --------------------------------- Capacity and LOS

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ECI 161 Winter 2012 Procedure for Determining LOS for Multilane Freeways and Highways circle5 Base conditions and Capacity circle5 Determine free flow speed circle5 Determine analysis flow rate circle5 Determine Density and LOS
ECI 161 Winter 2012 Freeway Base Condition circle5 12-ft minimum lane width circle5 6-ft minimum right-shoulder clearance circle5 2-ft minimum left lateral clearance circle5 Passenger cars only in the traffic flow circle5 Five or more lanes in each travel direction circle5 Almost level terrain (no grades greater than 2%) circle5 Drivers are familiar roadway users Freeway LOS

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ECI 161 Winter 2012 Determining FFS circle5 Measure FFS in the field Low to moderate traffic conditions circle5 Use a baseline and adjust it (BFFS) ID N LC LW f f f f BFFS FFS - - - - = FFS = free-flow speed (mph) BFFS = base free-flow speed, 70 mph (urban), 75 mph (rural) f LW = adjustment for lane width (mph) f LC = adjustment for right-shoulder lateral clearance (mph) f N = adjustment for number of lanes (mph) f ID = adjustment for interchange density (mph) Freeway LOS
ECI 161 Winter 2012

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ECI 161 Winter 2012 Lane Width Adjustment (f LW ) circle5 Base condition (f LW = 0) Average width of 12 ft. or wider across all lanes From Highway Capacity Manual , 2000 Freeway LOS
ECI 161 Winter 2012 Lateral Clearance Adjustment (f LC ) circle5 Base condition (f LC = 0) 6 ft. or greater on right side 2 ft. or greater on left side From Highway Capacity Manual , 2000 Freeway LOS

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