The need exists for accurate, portable, non-intrusive traffic monitoring systems to support the planning, management, operation, and maintenance of highway systems. Spectra Research has developed an ORADS traffic sensor unit under a previous ODOT research project. The proof of concept was demonstrated by development and testing of this unit. The current design needs continued mechanical, electronic and optical refinement to improve portability, accuracy, and calibration technique. During development, Spectra Research found ways to solve these problems and is proposing modifications that will significantly improve operation and reliability of the next generation of ORADS.

The objectives are to refine the current ORADS design to incorporate mechanical, optical and electronic improvements noted during development. This effort will focus on simplifying and ruggedizing mechanical parts, electronic and optical alignment adjustments and checkout procedures, reduce battery power consumption, provide a simplified enclosure, reduce weight, reduce manufacturing costs, implement a low battery shutdown circuit, and make the ORADS a stand alone system. Comprehensive road testing will be performed and documented, and personnel training will be included.

The proposed study approach includes an initial review of requirements to refine the hardware and software requirements for the ORADSII which will be used in the system design. Mechanical, electronic, and software engineers will develop the anticipated designs. Hardware and embedded software development will follow. Fabrication and assembly of sensor fixtures and components will be determined through competitive bidding. Test fixtures will then be designed for pre-alignment of the optical bench assemblies. Sensor system operation will be checked in the laboratory with tire targets. Upon completion of the optical/mechanical sub-system assembly, software will be downloaded to the system and overall system performance testing will begin. After completion of the preliminary tests, the ORADSII will be taken to a parking lot or other suitable area for low speed tests to check speed and axle spacing measurement and operation of embedded software. The low speed tests will be followed by multiple-lane highway tests to measure all aspects of ORADSII operation and accuracy. Prototype delivery and data collection and analysis will be the final stage prior to the final report and documentation.

The funding for this study would come from a pooled fund. Participating states would receive a 4% discount on the purchase price of the next generation of ORADS. A contribution of $50,000 is recommended, but other levels of participation are also welcomed. Ohio anticipates starting this study as soon as possible. Please contact us with any questions or comments.