Thanks. A lot of the terminology is US-centric as well, so the Wiki wasn't too helpful. Some elements that superficially refer to the same aspect of a road also appear to be duplicated or superseded, with conflicting notes about which to use. I realise trying to fulfil the spirit doesn't necessarily comply with the letter. The lanes would obviously be unsuitable to a driver using a map and brain, which the signage system has yet to catch up with (if they look at signs).