Southwestern Ontario is the freight backbone of the Canadian auto industry and the country's busiest commercial border. The 401 runs from the GTA all the way to Windsor, where the Ambassador Bridge and the new Gordie Howe International Bridge connect to Detroit and the I-75 corridor — together moving roughly $700 million in daily cross-border freight. The 402 spurs west from London to Sarnia and the Blue Water Bridge crossing to Port Huron, Michigan. The 403 services Brantford, Cambridge, and the Kitchener–Waterloo tech-and-manufacturing corridor. Each of these arteries generates structural IOS demand for trailer parking, container drops, and equipment staging.
The region's industrial submarkets are tightly tied to anchor industries. Windsor and Essex County are dominated by automotive assembly and parts (Stellantis, Ford engine, NextStar EV battery plant, hundreds of Tier 1 and 2 suppliers) plus a growing cross-border 3PL footprint. London anchors the centre with a diversified industrial base — food processing, advanced manufacturing, and 401-corridor logistics. Kitchener–Waterloo and Cambridge host Toyota's Cambridge plant, BlackBerry-era tech infrastructure repurposed for advanced manufacturing, and significant 3PL activity. Sarnia's Chemical Valley anchors petrochemical and refining, with associated heavy-equipment and tanker-truck yard demand. Woodstock and Guelph fill in 401 mid-corridor logistics.
The 2024–2026 EV-battery investment cycle has materially tightened the Southwestern Ontario industrial market. The NextStar plant in Windsor, Volkswagen's PowerCo gigafactory in St. Thomas, and Honda's Alliston EV ecosystem (just outside the formal region but pulling supply chain inland) have triggered a wave of supplier site-selection activity. Vacancy on industrial land has compressed, and IOS-suitable parcels along the 401 between London and Tilbury are leasing within weeks of being listed.