The Nature of Traffic Flow on Freeways - 1026 Words

INTRODUCTION A modified approach to explaining the nature of traffic flow on freeways is described in this research. It has its beginnings in the observations of actual traffic data, which are not easily and convincingly explained by the conventional traffic flow theories. Most conventional approaches to studying the relationships between traffic flow characteristics use loop detector data. The loop detectors are typically 6 by 6 ft inductive loops of electric wires. When a vehicle passes or stops over such a detector, loop inductance decreases and that induces a higher oscillation frequency, which then invokes a pulse indicating the presence of vehicle. The Inductive Loop Detectors (ILD)’s typically measure flow (the number of vehicles that pass it in some time period) and occupancy (the percentage of time for which the ILD is occupied in that time period). But the data provided by such ILDs are often fraught with errors. ILDs under-count or over-count under different freewa y traffic conditions. Also the accuracy and consistency of detector data depend strongly on their installation and calibration procedures. A loop detector with percentage accuracy within 5% is considered a ‘good’ one. This research aims to present a simple queuing analysis of freeway traffic that does not rely on vehicle occupancy data or effective vehicle lengths. Queuing Analysis Delay time= Actual travel – Ideal travel time Ideal travel time: †¢ Travel time under free flow conditions †¢ Travel timeShow MoreRelatedTraffic Congestion Of Highway Congestion Overtime3140 Words   |  13 Pagesfrustrations and delays; from waiting in a doctor’s office to standing in line at the grocery store. Historically, traffic congestion is a common annoyance throughout the United State and with the increase in population, overtime has gotten much worse. 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