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Skip Navigation LinksMcKay-Road-Interchange-Highway-400 McKay Road Interchange Highway 400

Road Design Project

McKay Road Interchange at Highway 400 

The scope of work is to provide engineering services for an Operational & Safety Analysis and the detailed design of the Parclo A-3 interchange at Highway 400 and McKay Road and supporting infrastructure.

Project Updates

May 2020
  • IBI Group retained as detailed design consultant
  • Field Investigations underway (Environmental surveys, Tree Inventory, Topographic Survey, Legal Survey)
  • Exploratory works (geotechnical investigations) at 17 McKay Road E property anticipated in Q2 2020
  • Formulation of base plans underway
  • 30% Design anticipated in Q2 2020
September 2019
  • IBI Group retained as detailed design consultant
  • Field investigations underway (Environmental surveys, Tree Inventory, Topographic Survey, Legal Survey)
  • Formulation of base plans underway
  • 30% design anticipated in spring 2020

Project Features

The Design Concept includes:

  • A new interchange at McKay Road and Highway 400;
  • Widening McKay Road from two to four lanes on the bridge and in the vicinity of the interchange;
  • Provision of sidewalks and bike lanes on each side of the road;
  • Reduced posted speed from 80 km/h to 60 km/h; and
  • Minimizing property impacts through design mitigation and refinements.

McKay Road Interchange Structure

The existing McKay Road overpass was replaced by MTO and opened to traffic in October 2017. The replacement bridge was constructed on the existing McKay Road alignment and accommodates two lanes of 3.50 m with 2.0 m side clearances.

The structure spans the existing (6-Lane) and future (10-Lane) Highway 400 cross-sections.

The replacement bridge has been designed to accommodate this future widening as the northbound lanes will be accommodated under the easterly span (where the existing Highway 400 is located) and the southbound lanes will be accommodated by the westerly span (currently unused ROW).

To accommodate the interchange, the overpass structure will have to be widened by 27.3 m, to an ultimate width of 38.9 m. The McKay Road replacement bridge was specifically designed to accommodate a future structural widening for the purpose of an interchange, including accommodating minimum vertical clearances (5.1 m).

 Schedule

Design  2019–2021
Property Acquisition2020–2021
Construction Commence 2023

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