Hitching is fairly easy in Scotland, except around big cities and in built-up areas, where you'll need to use public transport. Although the northwest is more difficult because there's less traffic, long waits are unusual (except on Sunday in 'Sabbath' areas). On some islands, where public transport is infrequent, hitching is so much a part of getting around that local drivers may stop and offer you lifts without your even asking.
It's against the law to hitch on motorways or their immediate slip roads; make a sign and use approach roads, nearby roundabouts or service stations.
Hitching is never entirely safe, however, and Lonely Planet doesn’t recommend it. Travellers who hitch should understand that they are taking a small but potentially serious risk.