Länsiväylä (the Western Highway, Swedish: Västerleden) is a motorway in the Greater Helsinki area of Finland, mainly at the Helsinki conurbation. It is part of the Finnish national road 51. The road begins in Ruoholahti in western Helsinki and continues west through the island of Lauttasaari and then across the city border to Espoo. The Länsiväylä road continues all the way throughout the southern part of Espoo. When finally crossing the border west to Kirkkonummi.