Downtown Pittsburgh is compact and designed to benefit pedestrians, with parks and plazas spaced out between the office towers and shopping streets. If visitors need to travel further, they descend to the subway known locally as the 'T'. It's a small, clean, and reliable light rail system.The city has an extensive bus network with multiple routes connecting downtown to the attractions on the north side, as well as Oakland and surrounding neighbourhoods. The Central Business District is a Free Fare Zone and buses are free from 4am to 7pm daily, while the 'T' is free 24 hours a day.Pittsburgh's taxi cabs usually need to be called by telephone or hired at a taxi rank, rather than hailed on the street. Cars rental companies offer services in the city. Uber, Lyft, and other similar ride-hailing apps and taxi services are also available.