Recently (I don’t know if they are new or if I have just been unobservant in the past) I have noticed odd devices attached to bridges over motorways.
They look almost like the “old style” CCTV camera housings, but appear to be hollow - the shape is almost like a rectangular cowbell, or maybe those loudspeakers you get at outdoor fairs, for want of a better description, and they are angled down slightly towards the road. Sometimes there is one above each lane.
I don’t think they are cameras - as I say they appear to be hollow, rather than having a lens in the end. Are they some kind of radar thing maybe? Are they something that’s likely to catch me for speeding? (If I were that way inclined)