Bedford new cameras going in today at 5am what are they?

[ratboiler]

As above I was coming into work this morning and passed workmen chaining a black box to a lamp post by the Sainsbury roundabout going into Bedford. Then passed another group outside Nando's by the river doing the same, then another group on the other side of the river. By the time I got to the last group my interest was up and noticed two camera's bolted to the lamp post.
I am assuming they are to catch road tax evaders, comments please.