The motorway operators are required to build, operate and maintain their networks at cost and to cover their expenses from the toll they collect. The tolls vary according to the building and maintenance costs of the motorway and the type of vehicle. Consequently, tolls can be expensive. For example, the typical Milan-Naples route of around 700 km costs approximately €40. There are additional toll roads in Italy in the urban areas of Venice and Florence where tourist buses must pay a fee to enter the city.