Downtown Toulouse is fairly flat and compact, so visitors can comfortably see most sights on foot or by bicycle. Longer journeys can be conquered with the city's public transport, which includes bus, tram and metro lines throughout the city. There are also free shuttle buses circling the historic city centre, which can be hailed. Taxis must be pre-booked; driving in the city can be frustrating as parking is extremely limited, and hiring a car is not recommended unless for excursions outside of town.