Public transport is limited and Canberra is spread out, with limited weekend bus services and little transport after about 10pm, meaning that visitors are best off hiring a car. There is plenty of parking at the tourist sites and the road system is excellent and uncongested. To hire a car drivers must be 21 years of age and hold a valid driver's license, sometimes in conjunction with an international driver's permit. The Action bus company routes cover most tourist attractions from four town centre bus interchanges: City, Woden, Tuggeranong and Belconnen. A day bus pass is available from bus drivers or the tourist information centre. Cycling is also a popular means of transport in Canberra and there is an extensive network of bicycle paths around the city. Taxi ranks are available in most major areas of the city and when taxis cannot be found on the street they can be ordered by phone.