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由西安公路研究所和交通部重庆公路科学研究所研制的高速公路监控系统硬件设备——有源环车辆检测器、磁翻转型大型可变情报板和可变限速标志,最近在西安通过国家鉴定。这几项成果,是我国“七五”期间国家科技重京攻关项目24—4—2专题,它们的研制成功对促进我国高速公路的发展和对高速公路加强现代化管理将起到重要的作用。由西安公路研究所研制成功的有源环车辆检测器,由环形线圈、振荡电路、放大整形、光电隔离、计算机检测电路等几部分组成,可同时自动检测四个车道上的车辆有无、交通量
Highway monitoring system hardware equipment developed by Xi’an Highway Research Institute and Chongqing Highway Science Research Institute of Ministry of Communications - Active Loop Vehicle Detector, Magnetic Flip-up Large Variable Information Board and Variable Speed Limit Sign, recently passed the national Identification. These achievements are the 24-4-2 special topics for the state key project of science and technology during the “Seventh Five-Year Plan” in our country. Their successful development will play an important role in promoting the development of the expressway in our country and strengthening the modern management of the expressway. The active loop vehicle detector developed by Xi’an Highway Research Institute is composed of loop coil, oscillation circuit, enlargement and shaping, optical isolation and computer detection circuit. It can automatically detect the presence or absence of vehicles on the four lanes, traffic the amount