Explore details about location Highway 400 Southbound. Highway 400 Southbound is a location situated within the Vaughan alongside other areas such as Ashton Drive, Ramp to Highway 407 Express Toll Road Westbound, Rivermede Road. Additionally, some smaller parts of Highway 400 Southbound include specific areas like Steeles Avenue West, Old Weston Road, Ramp to Highway 400 Southbound adding to the diversity of its landscape.