Paris has an excellent public transport system, divided into five zones radiating out from the centre; ticket prices vary according to the number of zones required. Public transport consists of buses, an underground metro, and express trains (RER). Taxis are also available. The easiest way to get around is on the metro and the subways are generally safe at all times. It is possible to transfer between the metro and the RER trains at no extra cost. The bus system is also extensive, but is slower, less frequent and best used for getting to destinations the metro does not cover. A nightbus service, Noctilien, covers the city between 1am and 5.30am. Taxis are readily available and can be hailed or caught at taxi ranks. Vélib' bicycle rentals are also popular for getting round town: pick up a bike at one of over 1,200 stations and return it at any other.
