trunk road

noun

noun

UK An important main road used by long-distance traffic, as well as heavy lorries.

North of Tain [...], the line reaches the southern shore of Dornoch Firth. Here, the railway and the A9 trunk road, which have hitherto run close together, diverge.2021 October 20, Paul Stephen, “Leisure and pleasure on the Far North Line”, in RAIL, number 942, page 49:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.