The cheapest way to get into the city from Warsaw’s international airport is by the city bus which transports you all the way to the Old Town. Don’t forget to validate your ticket before you board the bus. The majority of Warsaw’s city centre is best explored on foot, however, cycling is also popular. While the city is flat and easy to navigate, you should beware of the famously irritable Warsaw drivers and, perhaps, follow the heed of locals and share the pavement with pedestrians. Warsaw’s integrated public transport system includes tram, bus and metro lines. You need to buy a ticket before boarding the buses, trams and metros, these are sold at newsstands, some hotels, post offices and metro stations. Tickets, timetables and information can be found at ZTM information desks at underground stations within the city. For the vast majority of trips, a jednorazowy bilet (single) will suffice. It costs 2.80zl. For several journeys within a short period of time, you can get a 90-minutowy bilet (90 minute ticket).