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Or it could be as simple as lights in steel housings attached to aluminum poles.
Source: https://www.fark.com/comments/12751298?utm_source=feed&utm_medium=comments&utm_campaign=fark
Signs should be placed in areas where there are visible camera housings - but this isn’t mandatory.
Source: https://www.birminghammail.co.uk/black-country/little-known-rules-speed-cameras-28157686