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原文传递 A Real-Time Demonstration Prototype to Estimate Link Travel Time and Speed Based on Probe Vehicles on the Rural I-70 Corridor in Colorado

题名：	A Real-Time Demonstration Prototype to Estimate Link Travel Time and Speed Based on Probe Vehicles on the Rural I-70 Corridor in Colorado
作者：	Sarosh I. Khan; Richard Griffin
关键词：	Real-Time Demonstration Prototype; Travel Time and Speed; Probe Vehicles; Rural; Corridor; Colorado
摘要：	This paper presents the findings of a study that demonstrates the feasibility of estimating link travel time and speeds in real-time for a rural, mountainous section of an interstate freeway in Colorado using vehicles instrumented with global positioning system receivers, serving as probes in traffic streams. The system configuration proposed includes a very cost-effective, portable GPS deployment unit, communication links to a PC server, and an integrated prototype system for vehicle tracking, estimating statistics on link travel time and a user interface. The section of the I-70 corridor in Colorado selected for this study is located in a mountainous terrain just east of the Eisenhower Tunnel - gateway to the ski resorts, including Winter Park, Vail, and Aspen, from the Denver International Airport. It carries high traffic volume during the ski season and also during the summer months. Currently there is very limited surveillance infrastructure to monitor traffic conditions for this critical corridor. In this mountainous terrain, loop detectors are difficult to maintain due to icy conditions and snow removal practices. Video surveillance is also not feasible due to limited communication links. This study, funded by the Colorado Department of Transportation, was carried out in two phases to explore the feasibility of monitoring this corridor using mobile surveillance technology. The objective of the first phase was to identify the most cost-effective means of monitoring traffic and the communication link to send the probe data to a Traffic Operation Center (TOC) from this rural, mountainous stretch of the I-70 corridor. In addition, an algorithm was designed to estimate average link speed, travel time and the standard error of estimates to provide user information on the reliability of the estimates. The algorithm was tested for different traffic conditions and geometric characteristics of links. In the second phase of the project, a real-time demonstrational prototype was developed to receive, process and estimate link travel time and speed statistics in real-time based on the algorithm proposed in the first phase. In addition, the GPS receivers were deployed using a commercial vanpool service. The findings of the extensive field study are also documented.
总页数：	ITS America. Meeting (11th : 2001 : Miami Beach, Fla.). ITS connecting the Americas : ITS 2001 : conference proceedings. 2001. pp15
报告类型：	科技报告