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原文传递 SAN DIEGO'S SMART CALL BOX FIELD OPERATIONAL TEST - FINAL REPORT.

题名：	SAN DIEGO'S SMART CALL BOX FIELD OPERATIONAL TEST - FINAL REPORT.
作者：	Churchill-BW
关键词：	SAN-DIEGO-CALIF; CALL-BOXES; FIELD-TESTS; FIELD-OPERATIONS; INTELLIGENT-TRANSPORTATION-SYSTEMS; CONTROLLERS-; MOTORIST-AID-SYSTEMS; INSTITUTIONAL-FACTORS; FEASIBILITY-STUDIES; TRAFFIC-CENSUS; WEATHER-REPORTING; HAZARDS-; INCIDENT-DETECTION; TRAFFIC-SURVEILLANCE; CAMERAS-; LOOP-DETECTORS; STANDARDIZATION-; CELLULAR-COMMUNICATIONS
摘要：	The San Diego Smart Call Box Field Operational Test was one of sixteen such grants awarded in January, 1993. The Field Operational Test (FOT) concluded in August, 1996 after only six months of data collection. Much of the 2 years and 9 months in the interval between grant award and commencement of data collection was lost to the overhead of the FOT process, procurement of a project manager and test participants and delays in system integration efforts. The objectives of the FOT were to evaluate the technical feasibility and desirability of using the existing call box infrastructure in the dual role of surrogate roadside controller for selected ITS applications and the baseline motorist aid function. Objectives also included the evaluation of the institutional factors involved in a dual role deployment of call boxes. The Smart Call Box FOT was designed to be completed in three phases to reduce the technical risk of deploying five ITS applications. These included traffic census, weather hazard reporting, CMS control, incident detection and camera surveillance and control. Testing focused on the call box ability to pass control and surveillance data in a cellular communications environment, not on the connected sensor performance. The results of the test were mixed. The CMS subtest was dropped due to difficulties interfacing to the Caltrans standard CMS design. The traffic census and weather hazard reporting functions were successful but reliability of the tested configuration was indeterminate due to limited data. One significant accomplishment was the successful integration of loop counter electronics into the call box electronics enclosure thus simplifying installation and lowering site costs. Incident management was limited to the detection of simple speed thesholds and was not effective in an operational environment. Camera surveillance was successful with fixed field of view cameras and under somewhat constrained conditions. Some of the test sites were rigged with AC power, thus limiting the evaluation of the call box's self-contained battery and solar panel system across the full range of external sensors tested. Ultimately, the success or not of individual subtests hinged more on the call box contractor's ability to successfully integrate external sensors than on any other factor. This in turn highlighted the significant problem of lack of standardization among traffic sensing and control devices as well as the associated communications protocol and applications software. This problem will continue to exist in the near term for many ITS deployments and is not limited to smart call boxes.
总页数：	Conference Title: Merging the Transportation and Communications Revolutions. Abstracts for ITS America Seventh Annual Meeting and Exposition. Location: Washington, D.C. Sponsored by: ITS America. Held: 19970602-19970605. 1997. pp41-42
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