Lordy, I do seem to recall one of those police chase vid programmes though, where a stolen American tractor unit was barrelling along a multi-lane road heading for some tollbooths. The police cleared the booths of all traffic so he could just belt through without killing anyone who got in the way, they reckon it blitzed through at over 100mph!

The "rigs" over there seem to be a kinda law unto themselves as well, from what I've seen on TV where they'll blast their horn at you to pull over rather than they slow down, and that's on an A-road...
I remember going pretty quickly myself from Redditch, starting at about 3.20am back up North and covering 200miles in 3 hours (but I wasn't being ridiculous, just that the lack of traffic allowed to me to hold a near constant 80 as soon as I'd cleared the roadworks outside Redditch), some of the stuff I saw then was pretty surprising, everyone else taking advantage of the lack of traffic. A LWB Sprinter (yeah I know) blitzed by doing 100 easily, a BMW 540 and a Jaguar XJR, big exec cars, they must have been doing near 140, within about half an hour of each other. Loads of diesel mundane cars doing well over 100. A big flatbed entered in front of me, still doing 80, and 'cos it had accelerated up a sliproad, I caught it a bit, but it was soon going AWAY from me, I thought at the time that there was something up with that!
It was all perfectly safe as well, even the BMW and Jag, 'cos there was like no one else around...