Lagg Bridge (C147)
This is the 32 miles of Arran's ring road the island lost as an A-road: the A841 between Dippen and Lochranza via Blackwaterfoot was downgraded in 2009, and the C147 now runs round the south coast and up the west. It keeps the bones of a trunk road, two lanes most of the way, but the south coast between Kildonan and Blackwaterfoot narrows to passing places in stretches, so the driving is about reading where the width gives out rather than hunting for corners. The Sliddery section is the most undulating, with a twisting drop to Sliddery Bridge and a climb straight back out.
The Ross Road joins between Sliddery and Lagg at the war memorial; it is single-track with passing places, so give anything emerging from it room. The Lagg Hotel, the oldest inn on Arran and dating from 1791, and the distillery that opened in 2019 are the obvious stops.