> In my experience driving in the U.K, most of the major roads (motorways/dual carriageways)have average speed cameras liberally placed on the road.

Most major roads definitely do _not_ have average speed cameras placed liberally along them. The only average speed cameras I can recall encountering are at roadworks sites (a move I 100% support) and along a couple of more scenic A-roads that are particularly enjoyable to drive along at high speed.

There are plans to introduce more average speed cameras on the new managed motorways, but I feel it is incorrect to claim they are liberally placed along most major roads.