In London, Peak Day Travelcards allow travel at all hours. Off-peak Day Travelcards are 20–50% cheaper but are valid for travel only after 9:30am and on weekends. This is an attempt to encourage commuters' travel on the London Underground, Docklands Light Railway, buses, and trams outside of the crowded weekday morning peak. There is a similar system on Transport (Bus and Tyne and Wear Metro) in the Newcastle upon Tyne area. In London, congestion charges are intended to discourage driving between 7 am and 6 pm.