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Most police LIDAR's work around 900nm range or the just inside the Infra Red spectrum. The are also pulsed lasers as opposed to continuous wave. There may be some other wavelengths used but they are not very far from the 900 nanometer wavelength. Typical beam divergence is .3 meters for every 100m distance or 3 feet per 1000 foot distance. This is a very common wavelength and is used in such applications as medical or dental laser as well as TV remotes. But basically, if you can see the light it's not IR. Taillights and headlights are visible so not in the IR spectrum.
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