The people who deliver new cars in the UK are well known for hitchhiking home. I think they are on a fixed fee, so hitching saves them money. You will see them holding their 'trade plates' (temporary registration plates that dealers can use without having to tax and insure the car registration) out to let other professional drivers know they are professionals. I met one in the Midlands once who had already driven to Edinburgh and hitched all the way back in the day. You often see them on the exits of motorway services where a lorry driver has dropped them so they can find someone going their way.