Highway 403 is a major provincial highway in Ontario, Canada. It runs approximately 113 kilometers, connecting the cities of Brantford and Mississauga. The highway serves as a vital route for commuters and commercial traffic, facilitating travel between the Greater Toronto Area and southwestern Ontario. Originally opened in the 1960s, Highway 403 features multiple interchanges and connects with other major highways, including Highway 401 and Highway 407. It is known for its scenic views, particularly as it passes through the Niagara Escarpment, and plays a crucial role in the region's transportation network.