The most popular way to get around in Amarillo is hiring a car at one of the international agencies in the city. To hire a car, a full national driver's license, and in some cases and international driver's license, is required and drivers must be at least 25 years (some companies hire cars to those aged 21 to 24 with surcharges). Amarillo has a bus service that runs from Monday through Saturday between 6.15am and 6.45pm and taxis are a good way to get around but must be booked through one of the many private taxi companies operating within the city.