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| King's Highway 403 | |
|---|---|
| Country | Canada |
| Province | Ontario |
| Type | King's Highway |
| Route | 403 |
| Length km | 166.0 |
| Established | 1963 |
| Direction A | West |
| Terminus A | Mississauga (presently near Hwy 401) |
| Direction B | East |
| Terminus B | Hamilton, Ontario / Brantford |
| Cities | Mississauga, Burlington, Hamilton, Brantford, Woodstock, London |
King's Highway 403 is a controlled-access highway in Ontario serving the Golden Horseshoe region and parts of Southwestern Ontario. The route connects major urban centres including Mississauga, Burlington, Hamilton, and extends toward Brant County and Woodstock toward London via connections with other provincial routes such as Ontario Highway 401 and Highway 403 auxiliary alignments. The highway forms part of the provincial network managed by the Ministry of Transportation of Ontario and intersects with important corridors like Queen Elizabeth Way, Highway 401, and Highway 6.
The corridor begins in the west near Mississauga and traverses urban and suburban landscapes, intersecting arterial routes such as Dundas Street, Hurontario Street, and regional roads administered by Peel Region. As it approaches Burlington, the highway passes near landmarks like the Royal Botanical Gardens, Burlington GO Transit, and industrial zones that connect to Hamilton Port Authority facilities. Entering Hamilton, the route negotiates the Niagara Escarpment and provides links to local collector roads serving McMaster University and St. Joseph's Healthcare Hamilton. Eastward, the roadway continues through agricultural plains toward Brantford and Woodstock, where it interchanges with secondary highways such as Historic Highway 2 and forms part of a network connecting to London and Kitchener–Waterloo.
Initial sections were planned during the postwar expansion of Ontario's King's Highways system alongside projects like the Queen Elizabeth Way and the expansion of Highway 401. Early construction in the 1960s paralleled developments at Malton Airport and industrial growth in Mississauga. Through the 1970s and 1980s, upgrades mirrored regional shifts influenced by institutions such as Ontario Highway Transport Board decisions and municipal planning in Halton Region and Peel Region. The corridor saw major interchange reconstructions influenced by traffic studies conducted by the Ministry of Transportation of Ontario and consulting firms involved in projects with bodies like Infrastructure Ontario. Environmental reviews referenced areas such as the Cootes Paradise marshland and engaged organizations including the Department of Fisheries and Oceans and the conservation authority Conservation Halton.
Traffic volumes have been shaped by commuter flows to employment centres like Pearson International Airport, corporate campuses in Mississauga, and port-related freight to Hamilton Port Authority. Peak congestion ties to overlaps with corridors such as Highway 401 and cross-border freight to Queenston–Lewiston Bridge and the Peace Bridge via connecting routes. Transit and intermodal activity involve GO Transit rail and bus terminals, freight operators such as Canadian National Railway and Canadian Pacific Kansas City, and distribution hubs for companies like Amazon and Canadian Tire. Safety and collision data are monitored in coordination with agencies including Ontario Provincial Police and municipal police services in Burlington and Hamilton.
Design elements include multi-lane divided segments, collector–express configurations near major interchanges, and grade-separated interchanges influenced by standards from organizations like the Transportation Association of Canada. Bridges crossing waterways such as the Credit River and structural works near the Niagara Escarpment employ engineering practices from firms tied to projects funded through provincial capital budgets and programs administered by Infrastructure Ontario. Intelligent Transportation Systems use field equipment interoperable with regional traffic management centres like those in Peel Region and Halton Region, and signage follows standards codified with input from the Canadian Standards Association.
Key junctions tie the route to corridors including the Queen Elizabeth Way, Highway 401, Highway 6, auxiliary connectors, and municipal expressways serving Mississauga and Hamilton. Interchanges provide access to transit hubs such as GO Transit stations, to port facilities under the Hamilton Port Authority, and to logistic sites serving Oakville, Stoney Creek, and Dundas. The network interlinks with arterial roadways like Dundas Street, Main Street, and provincial highways including Highway 2.
Planned improvements reflect regional growth strategies promoted by bodies such as the Greater Toronto Area planning authorities, Halton Region, and Peel Region. Proposals include interchange upgrades studied with environmental assessments overseen by the Ministry of the Environment, Conservation and Parks and capacity enhancements coordinated with freight stakeholders including Transport Canada and municipal economic development offices in Hamilton and Mississauga. Long-term scenarios consider integration with transit initiatives like expanded GO Transit services, potential linkages to regional rail projects discussed by Metrolinx, and resilience measures responding to climate projections from agencies such as Environment and Climate Change Canada.
Category:Provincial highways in Ontario