Explore details about location Highway 404 (under construction). Highway 404 (under construction) is a location situated within the East Gwillimbury alongside other areas such as Parnham Crescent, Ramp to Highway 404 Southbound, Green Lane West. Additionally, some smaller parts of Highway 404 (under construction) include specific areas like Leslie Street, Ramp to Highway 404 Northbound, Green Lane East adding to the diversity of its landscape.