Travel Time Estimation on the San Francisco Bay Area Network Using Cellular Phones as Probes
Travel Time Estimation on the San Francisco Bay Area Network Using Cellular Phones as Probes
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发表时间：
2000-09
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通讯作者：
J. Ygnace;C. Drane;Y. Yim;Renaud de Lacvivier
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作者：
J. Ygnace;C. Drane;Y. Yim;Renaud de Lacvivier
目前的交通行驶时间估计很大程度上是基于嵌入在路面上的道路传感器。今天，蜂窝定位技术的发展和无线电话的普及提供了跟踪配备手机的司机作为交通探测器的机会。联邦通信委员会增强911 （E-911）的第二阶段授权要求无线运营商必须在2001年10月1日之前向公共安全应答点（PSAP）提供911无线呼叫的位置，大约在125米内，或者在大多数情况下小于十分之一英里。本研究的动机是评估在湾区网络中使用手机作为流量探测器的可行性。对蜂窝定位技术的回顾、分析模型和仿真模型表明，可以获得准确的行程时间估计。假设至少有5%的高速公路旅行者配备了手机，人们可以预测高速公路连接时间估计的准确率为95%。E-911的授权将成为实施这种蜂窝定位的驱动力。然而，可以根据交通主管部门和信息服务提供商的要求，制作或改编和存储来自作为探测器的手机的交通信息，并可能成为一个重要的商业机会。该报告还主张对GPS、蜂窝和传统系统进行联合实地评估，以便确定未来实施的最佳技术组合。本报告还介绍了适宜卫生技术方案组织在促进这些技术在加州更快部署方面可能发挥的体制作用。
Current traffic travel time estimates are largely based on road sensors embedded in the pavement. Today technical developments in cellular positioning and the spread of wireless phones provide the opportunity to track cell phone equipped drivers as traffic probes. The Federal Communication Commission Phase II mandate for Enhanced-911 (E-911) requires that wireless carriers must provide the location of a 911 wireless call by October 1, 2001 to the Public Safety Answering Point (PSAP), within approximately 125 meters, or under one-tenth of a mile in the majority of situations. The motivation of this research is to evaluate the feasibility of using cell phones as traffic probes for the Bay Area network. A review of cellular positioning techniques, an analytical model, as well as a simulation model show that accurate travel times estimates can be obtained. Assuming that at least 5% of freeways travelers are equipped with a cell phone, one can predict a 95% accuracy in freeway link travel time estimates. The E-911 mandate will be the driving force to implement such cellular positioning. However, the production, or adaptation, and warehousing of traffic information from the cell-phones-as-probes can be tailored for the requirements of traffic authorities and information service providers and may become an important business opportunity. The report also advocates the joint field evaluation of GPS, cellular and conventional systems, to allow the identification of the best mix of technology for future implementations. The possible institutional role of the PATH organization to foster a quicker deployment of these technologies in California is also presented in this report.