Using public transport is probably the most efficient way to travel around Budapest, especially if you are staying in one of the outer districts. The system is comprised of a wide variety of trams, buses, trolleys and metro trains and there is a reliable night service too. Public transport in the city is also considerably cheaper than other European capitals. Several tickets are available and include a single ticket, single transfer ticket, metro section ticket, 24-hour travel cards for groups and singles, a 72-hour travel card, 7-day travel-card, funicular, chairlift, night tickets and boat tickets. Anybody staying in the city centre will find it easy to travel around on foot. It is also possible to commute by bike but very few public transport lines will allow you to carry your bike on board.