Highway 401 is a major highway in the province of Ontario, Canada. It stretches approximately 828 kilometers (514 miles) from Windsor in the west to the Quebec border in the east. Known for being one of the busiest highways in North America, it serves as a vital transportation route for both commercial and personal vehicles. The highway features multiple lanes in many sections, accommodating heavy traffic flow. It connects several key cities, including Toronto, London, and Kitchener, making it essential for trade and travel. Highway 401 is also known for its extensive network of interchanges and access points, facilitating easy movement across the region.