This road is quiet alternative to A82 that runs along the side of Loch Lomond. Arrochar to Dumbarton (25 miles) A814, runs alongside Loch Long then to Garelochhead and down the side of Gare Loch. Then you can take in the sights of Helesbourgh before you reach Dumbarton. If you have traveled the A82, you know it can be busy at some points of the day. Although it is a longer route the A814 is a nicer alternative. Here is the Map.