Motorways are named AXX, where XX is a number. Numbers from 1 to 33 generally designate autostrade which are not beltways but may be parts of them (for example, one section of the A4 which is a part of the Milan beltway), while numbers from 50 to 91 designate beltways around larger cities. The A1, for example, connects Milan to Naples, the A50, A51, and A52 are part of the Milan beltway. Many motorways have nicknames ("Autostrada del Sole" meaning "Sun Highway" for the A1). The numbers have not been allocated methodically.