I do the free recovery on the M1 from M1J6 up to M1J10-11, we've got specs installed that are set to 50mph average speed.

I speak regularly to the technicians and know for a fact that ours will go off if they detect anything over 62 on average, I nearly always (traffic permitting) roll through them at 60mph in the Focus and Nova and haven't heard a peep through as of yet. Also helps that our trucks are exempt from the specs camera's, not that tits any good as the truck are limited to 56 lol

Its also the same situation on the M11 roadworks (London to M25), we also have lads there doing the free recovery.

I regularly pick up people that have had tickets from specs, most of them are middle aged blokes who drive big Mercs and think they are exempt from speed camera's.

They are not just set to slow people down for the fun of it, mainly to do with the heavy plant accessing the works entrances and exits and also for safety for the workforce...its not nice being sat under a 44ton artic taking the prop off when you got people coming past at 50mph 3foot from your head!!

Paul