Rownhams is the name of a service station in Southampton in the UK, along the [[M27 (GB)}M27]] before it splits up towards either London or Portsmouth and further on to the East. It is a superb spot for getting a lift to London; lifts towards the east may take a while longer, but are very much doable. Traffic isn't huge, but frequent enough for a steady flow of people going into and out of the service area for you to ask.