On the face of it, this seem to be a good idea. "IF" insurance premiums come down for the "good guys" ie. sensible, considerate driving within any speed limits, economical braking and acceleration etc. etc. and then hits the numpty drivers in the pocket - GREAT!
But but but... all HGV's have to be fitted with tachographs which shows amongst other things speed. This does not deter the vast majority of them from going waaaay over the 40mph limit (single carraigeway). Speeding HGV's are an evil menace on our roads. Might is right etc., yet rarely is anything done about it.
I look forward to the day when I "have" to fit one of these black box dooferisers to the Pinz. THAT will be a giggle!