Middle Road before reuniting with the westbound carriageway. After running north–south for along the western edge of Mississauga, Highway403 meets with Highway 407 again at a combination interchange where the two freeways curve 90 degrees to avoid crossing each other. Approaching this junction Highway403 westbound traffic defaults onto Highway407 so motorists have to continue on Highway403 via a semi-directional flyover that arcs from the west to the south. This north–south segment of Highway403 was originally planned as a temporary routing to be bypassed by a new direct Oakville-Burlington link; but in 1995 this routing became permanently part of Highway403 when the proposed link instead became part of Highway407. Highway407 continues to the north and west, while Highway403 turns east to follow alongside a hydro corridor through the centre of Mississauga. A portion of the Mississauga Transitway express bus service utilizes the freeway's right shoulders between Erin Mills Parkway and Mavis Road. Between Highway407 and Highway401, high-occupancy vehicle (HOV) lanes are present in the left shoulder lanes for vehicles with at least one passenger. Sandwiched between residential subdivisions on both sides, the freeway soon thereafter crosses the Credit River. On the other side of the river, between the interchanges with Mavis Road and Hurontario Street (formerly Highway 10), Highway403 skirts to the north of downtown Mississauga, as well as the Square One Shopping Centre. After a split with Eastgate Parkway, the freeway abruptly curves to the north. As the curve straightens, Cawthra Road's lanes converge with the freeway to form a collector-express system as it approaches the interchange with Eglinton Avenue, while the eastbound express-to-collector transfer also marks the start of another HOV lane. The portion of the highway between Hurontario Street and Eglinton Avenue is the busiest along the route, with approximately 180,000vehicles travelling it on an average day in 2016. After crossing Matheson Boulevard, the freeway's central HOV lanes terminate and merge with the express lanes. The freeway then approaches a sprawling interchange, with the express lanes curving east and defaulting to Highway401's express lanes east of that junction, while the collector lanes (including its HOV lane) pass under several sets of flyovers and thereafter continues north as Highway 410 to Brampton. The freeway's collector lanes also have connecting ramps to both directions of Highway401's collector lanes. History Though one of the first divided highways conceived for Ontario, Highway403 is one of the most recently completed freeways in the