A good network of bus routes covers the city and this is the main form of public transport. Buses are given exclusive use of certain lanes within the city, and as a result the services are fairly free-flowing. Exact change is required as one enters the bus, so buying a One-Ticket pass is a convenient option: this allows unlimited travel in and around the city by bus. Night buses come into operation after midnight, offering an economical way to get home after a night out. Black taxis are easily hailed in the street and there are numerous taxi ranks, but rates are a bit expensive. Rental cars can be useful for touring the country, but driving around Edinburgh's one-way, narrow streets can be confusing, and parking is difficult to find. The city is definitely best explored on foot for those who can handle the steep roads; in fact, any other mode of transport will deprive visitors of some glorious sights.