Brighton is a city on the south coast of England.
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Brighton is the major part of the city of Brighton and Hove (formed from the previous towns of Brighton, Hove, Portslade and several other villages) on the south coast of Great Britain. Formerly part of the non-metropolitan county of East Sussex, it remains part of the ceremonial county of East Sussex, within the historic county of Sussex.
North towards London
Take the Bus 5A towards Patcham and get off at Ridgeside Avenue. Follow the road Northwards (the direction the bus was going if you came from the city centre) until you get to a big roundabout. You want to take the A23 towards London. Several spots are available to hitchhike from, with space for cars to pull over.
There is also a modestly frequented petrol station, if you want to talk to people.
East towards Dover
Walk up Preston Road, wait somewhere near the park on the opposite side in a place where the cars can see you from the traffic light, such as just before the big bend. It's better if you have a sign saying something like "M25 East"
You can get dropped off in one of the laybys on the A23, before it turns into the M23 and from there you must only accept a lift that's going at least as far as Clacket Lane Services. Clacket Lane is an excellent place to hitch from, as is Maidstone Services further on. These are the only two service stations between Brighton and Dover (apart from Pease Pottage, but that's no good going in that direction, only to be used hitching to Brighton)(Disputed). Do not get out anywhere other than these service stations and you will move quickly. In the service stations just walk up to people and ask "Are you by any chance driving in the direction of Dover?" or something similar. Super-quick hitching guaranteed.