Also--what is a carriageway and what is a motorway, please? Apparently, carriageways can be "duel" (sic).

Ha ha! The duels are not likely to be on a dual carriageway...

carriageway n : (Brit) one of the two sides of a motorway where traffic travels in one direction only usually in two or three lanes

and

motorway n : a broad highway designed for high-speed traffic [syn: expressway, freeway, pike, state highway, superhighway, throughway, thruway]

both from www.dictionary.com

HTH

Hev