Microsoft Word - Two-lane Highway Capacity and Level of Service

# Microsoft Word - Two-lane Highway Capacity and Level of Service

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Two-Lane Highways (one lane each direction): Two Procedures: Two-way analysis (both directions of travel combined) Directional analysis (one of the two directions of travel) Two-Way Analysis: Base or ideal conditions: 12-ft minimum lane widths 6-ft minimum shoulder widths 0 % no-passing zones on the highway segment Only passenger cars in the traffic stream No direct access points along the roadway No impediments to through traffic due to traffic control or turning vehicles Level terrain (no grades greater than 2%) A 50/50 directional split of traffic Capacity: The capacity of extended lengths of two-lane highway under base conditions is 3200 passenger cars per hour (pcph), total, both directions. The capacity of single direction of a two-lane highway is 1700 pcph. Service measures: Percent time spent following (PTSF) Average travel speed (ATS) Functional classifications: Class I: Two-lane highways on which motorists expect to travel at high speeds. Class II: Two-lane highways on which motorists do not expect to travel at high speeds.

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Determining Level of Service (LOS): 1) calculate Free Flow Speed (FFS); 2) calculate Analysis Flow Rate (
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## This note was uploaded on 02/09/2011 for the course ECON 2250 taught by Professor Schultz during the Spring '11 term at UNO.

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Microsoft Word - Two-lane Highway Capacity and Level of Service

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