Alberta has over of highways and roads, of which nearly are paved. The National Highway Authority is responsible for the maintenance of national highways and motorways. Four major Interstate Highways surround the city. There are a total of of interstates and other highways in Massachusetts. Three major interstate highways run through Toledo. West Virginia is crossed by seven Interstate Highways. Paris has an extensive road network with over of highways and motorways. There are also several auxiliary Interstate highways in Maryland. Trucks weighing less than can use Vermont's interstate highways. Three of Wisconsin's Interstate highways intersect in Milwaukee. Waltham is close to several U.S. interstate highways. Atlanta is served by three major interstate highways. Worcester is served by several interstate highways. Snow affects the rights of way of highways, airfields and railroads. It is at the junction of four major highways and two major railroads.