A bus network operates around Albuquerque, but is not comprehensive enough to link all the major tourist sights, and most bus routes stop running at about 6pm. The sprawling city is difficult to get around without a car, while the simple layout makes driving easy, as long as rush hour is avoided. Most agencies require drivers to be at least 21 years of age. Metered taxis are also available and can easily be hired from outside main transport terminals and major hotels. Albuquerque also has an extensive bike route system.