Question: What year was the route that is a length of about 5320 km, and has the North Wales Expressway as a designated part to it ,extended?
Sentence (from "A55 road"): Its entire length is a dual carriageway primary route, with the exception of the point where it crosses the Britannia Bridge over the Menai Strait and several short sections where there are gaps in between the two carriageways.
Relevant evidence: No