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 c Base conditions and Capacity c Determine free flow speed c Determine analysis flow rate c Determine Density and LOS
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ECI 161 Winter 2012 Freeway Base Condition c 12-ft minimum lane width c 6-ft minimum right-shoulder clearance c 2-ft minimum left lateral clearance c Passenger cars only in the traffic flow c Five or more lanes in each travel direction c Almost level terrain (no grades greater than 2%) c Drivers are familiar roadway users Freeway LOS
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ECI 161 Winter 2012 Determining FFS c Measure FFS in the field Low to moderate traffic conditions c 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
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ECI 161 Winter 2012
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ECI 161 Winter 2012 Lane Width Adjustment (f LW ) c Base condition (f LW = 0) Average width of 12 ft. or wider across all lanes From Highway Capacity Manual , 2000 Freeway LOS
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ECI 161 Winter 2012 Lateral Clearance Adjustment (f LC ) c 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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This note was uploaded on 03/10/2012 for the course ECI 161 taught by Professor Tafazzoli during the Winter '12 term at UC Davis.

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

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