Major roads in New South Wales are organised into many routes. These help drivers to navigate their way between places in the state. Each route is given its own route number. The number consists of a letter (M, A or B) and a one- or two-digit number. 'M' routes are motorways, 'A' routes are national routes, and 'B' routes are state routes. The route system includes highways, motorways, and other important roads that have not been declared highways.