We examine the measurement uncertainty associated with different methods of calibrating the ubiquitous down-the-road (DTR) radar used in speed enforcement. These calibration methods include the use of audio frequency sources, tuning forks, a fifth wheel attached to the rear of the vehicle with the radar unit, and the speedometer of the vehicle. We also provide an analysis showing the effect of calibration uncertainty on DTR-radar speed measurement uncertainty.

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his article provides an overview of TC-41-Traffic Enforcement Technologies. The stated goals of TC-41 are to: ◗ Develop documentary standards, including design of test artifacts, test and measurement procedures, and minimally acceptable performance requirements; and technology guides for traffic enforcement technologies. ◗ Stimulate the interest of the scientific, academic, and industrial communities in traffic enforcement technologies by conducting workshops and supporting the publication of technical manuscripts. ◗ Promote the awareness, adoption, and harmonization of technical performance standards by local and state traffic enforcement authorities. ◗ Support the development of test and evaluation protocols and conformity assessment requirements. ◗ Maintain liaisons with other technical groups, societies, and organizations, both nationally and internationally, working in the same or similar area. There are two Project Authorization Requests (PAR)s associated with TC-41. P2450-Standard for the Performance of Down-the-Road Radar Used in Traffic Speed Measurements was established to ensure that there are a well-defined set of specifications and test methods for the performance of downthe-road radar. P2452-Standard for the Performance of Lidar Used in Traffic Speed Measurements was established to ensure that there are a well-defined set of specifications and test methods for the performance of lidar.

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