Charleston is fairly compact and it's easy to explore many attractions on foot or on a rented bicycle. To visit plantations and other attractions outside the city, hiring a car is the best option. A comprehensive and efficient bus service covers most areas in the city, operated by the Charleston Area Regional Transportation Authority (CARTA).Regular bus fare costs from $2 and a day pass costs $7. The most useful public transport for visitors is the tram system (DASH), offering free transport in the historic downtown area every day of the week. It's possible to reach many of the city's top attractions on the system. Taxis are available but must be called for.