Class_32_Multi-Lane_Highway_Capacity_and

Class_32_Multi-Lane_Highway_Capacity_and - The Pennsylvania...

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Unformatted text preview: The Pennsylvania State University Department of Civil and Environmental Engineering CE 321: Highway Engineering Class 32 Multi-lane Highway Level of Service Analysis Spring 2008 Introduction Do not have full access control. May or may not be divided. Four or six lanes (total); Posted speed between 40 and 65 mph; May have two-way-left-turn-lanes (TWLTLs). Traffic signals may be present. Lower design standards than freeways. More visual distractions than freeways. Introduction 2 Traffic signals spacing > 2.0 miles Limited on-street parking. Limited bus-stop usage. Limited pedestrian activity. LOS Criteria Figure 6.4. Multi-lane LOS Criteria from Principles of Highway Engineering and Traffic Analysis, 3 rd Edition. Multi-lane LOS Methodology Base conditions and capacity Determination of free-flow speed Determination of analysis flow rate Calculate service measure value and LOS Base Conditions 12-ft lane widths 12-ft total lateral clearance from roadside objects in travel direction Passenger cars only No direct access points along roadway Divided highway Level terrain Familiar road users Free-flow speed > 60 mph Multi-lane Highway Capacity Free-flow Speed (mph) Capacity (pc/h/ln) 60 2200 55 2100 50 2000 45 1900 Determining Free-flow Speed Mean speed of passenger cars during low- to moderate-flow conditions. Up to 1,400 pc/hr/lane Estimate FFS as follows: FFS = BFFS f LW f LC f M f A BFFS = base free-flow speed If posted speed is 40-45 mph, add 7 mph If posted speed is > 50 mph, add 5 mph f LW = adjustment for lane width (mph) f LC = adjustment for lateral clearance (mph) f M = adjustment for median type (mph) f A = adjustment for number of access points (mph) Adjustment for lane width (f LW ) Source: Table 6.3 from Principles of Highway Engineering and Traffic Analysis, 3 rd Edition, 2004....
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This note was uploaded on 06/08/2009 for the course CE 321 taught by Professor Petrucha during the Spring '02 term at Pennsylvania State University, University Park.

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Class_32_Multi-Lane_Highway_Capacity_and - The Pennsylvania...

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