In a huge city like Sao Paulo, roads can be extremely congested, with peak traffic between the hours of 6am to 9am and 4pm to 8pm. Driving is not recommended in the city, as parking can be as much of a problem as the traffic. There are hundreds of buses covering the city, but these can be very crowded and slow during peak hours. Buses won't stop unless hailed from the sidewalk, and pickpocketing is common.The subway system is usually the fastest option for getting around in Sao Paulo. The metro system consists of five colour-coded lines: Line 1 (Blue), Line 2 (Green), Line 3 (Red), Line 4 (Yellow), and Line 5 (Lilac), all of them operating from Sunday to Friday, from 4.40am to midnight, and on Saturdays until 1am for most lines.The Bilhete Único is a smartcard that makes it easy to pay for transport on Sao Paulo's buses, subways, and trains. You can buy them at underground stations, and charge them at newspaper stands with credits for public transportation.Taxis are freely available and absolutely essential after dark. White cabs can be found at stands near big venues and central areas. Radio taxis are more reputable and favoured by tourists, but are more expensive and must be ordered by phone.Sao Paulo is large and spread out. You won't be able to walk everywhere, but the various neighbourhoods are easy to negotiate on foot and are usually safe by day.