The efficient and very cheap public transport system makes Mexico City surprisingly easy to get around. It consists of the metro, buses, trolley buses and minibuses (peseros). The metro is the best method of travel, being fast and easy to use (6am to midnight), but bus routes are also very extensive and the buses are generally reliable, although more complicated for non-Spanish speakers to use. Peseros are smaller, more comfortable, and faster than buses, but slightly more expensive, and can be stopped anywhere along their set routes.All forms of public transport are heavily crowded during peak hours and are best avoided at this time. Visitors should also be aware that crime levels are high on all buses and the metro, particularly when crowded. Visitors should avoid travel on public transport at night and should take care of their possessions. Visitors should not hail taxis on the streets. Most hotels have official taxi drivers assigned to them or hotels and restaurants can call radio taxis, both of which are more expensive but safer and more reliable. Driving in the city is a nightmare and cars should be left in secure parking; renting is expensive and lone drivers are vulnerable to criminal assaults at night.