Initial Evaluation of the Existing Technologies for Vehicle Detection (1715-1)

Most vehicle detection today relies on inductive loop detectors (ILDs). However, problems with installation and maintenance of these detectors have necessitated evaluation of alternative detection systems. Replacing ILDs with better detectors requires a thorough evaluation of the alternatives. This evaluation included examination of the functional quality, reliability, and cost of these technologies as well as development of application of recommendations. The work plan for this study consisted of eight specific research objectives; the three included in this report are: a literature search; a survey of Texas and other states; and an evaluation of existing technologies for vehicle detection. Primary detection technologies included in this study are: video image detection systems (VIDS), passive infrared, active infrared, passive magnetic, radar, Doppler microwave, passive acoustic, and ILDs. Results of new detector testing clearly indicate promising alternatives to ILDs, but the limitations of these new detectors must also be accepted. Researchers found that some technologies performed quite well, while, in some cases, offering features that are more flexible than ILDs. These technologies include: VIDS, passive infrared, active infrared, radar, Doppler microwave, and pulse ultrasonic.