UPDATE: Wednesday, January 12th, 2011
Photo by Ian Turnbull
Applications of radar speed signs are typically made in an unscientific manner and are the result of either subjective judgment or, more rarely, engineering studies. The devices are placed wherever there is a perceived problem with little quantification of the problem itself.
As part of the COATS project, the project team has developed warrants for the use of radar speed signs in California, specifically in the COATS region. The project team reviewed the literature, and evaluated and synthesized the results from previous research on the use of radar speed signs (both stationary or trailer-based).
Summary tables of past research results of radar speed sign deployments are available here.