Level_of_Service_Notes

# Level_of_Service_Notes - Virginia Tech 1 Tansportation...

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Unformatted text preview: Virginia Tech 1 Tansportation Engineering Quick Review of Highway Level of Service Dr. Antonio A. Trani Professor of Civil and Environmental Engineering Virginia Polytechnic Institute and State University Blacksburg, Virginia Spring 2006 Virginia Tech 2 Introductory Remarks • Level of service on freeways and highways • Grading roads Virginia Tech 3 Review of Speed, Density and Flow Relationships Virginia Tech 4 Macroscopic Traf f c Flow Models In all traf f c F ow models, the following fundamental traf f c F ow equation applies, (1) where: is the traf f c F ow (vehicles/hr per lane), is the F ow speed (km/hr) and is the F ow density (vehicles per lane-km) Sample data for US Highways 401 is illustrated in the next three f gures. q u k ! = q u k Virginia Tech 5 Highway 401 Data (U.S.) The data shows the basic relationship between speed (u) and f ow (q) Data courtesy of Dr. H. Data courtesy of Dr. H. Rakha Rakha (VTTI) (VTTI) Virginia Tech 6 Highway 401 Data (U.S.) The plot shows the basic form of the density-speed relationship Data courtesy of Dr. H. Data courtesy of Dr. H. Rakha Rakha (VTTI) (VTTI) Virginia Tech...
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• Fall '08
• KATZ
• Atlantic Coast Conference, Highway, Freeway, Virginia Polytechnic Institute and State University, Blacksburg, Virginia

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Level_of_Service_Notes - Virginia Tech 1 Tansportation...

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