There are three through roads on the island. The coast road circumnavigates the island. In 2007, a stretch of this road, previously designated as A841, was de-classified as a C road. Travelling south from Whiting Bay, the C147 goes round the south coast continuing north up the west coast of the island to Lochranza. At this point the road becomes the A841 down the east coast back to Whiting Bay. At one point the coast road ventures inland to climb the pass at the Boguillie between Creag Ghlas Laggan and Caisteal Abhail, located between Sannox and Lochranza.