What is the Highway 427 Expansion?

The Highway 427 Expansion project includes the design and construction of the following:

A new 6.6 km extension from Highway 7 to Major Mackenzie Drive with:

  • eight lanes from Highway 7 to Rutherford Road;
  • six lanes from Rutherford Road to Major Mackenzie Drive;
  • three new interchanges (Langstaff Road, Rutherford Road and Major Mackenzie Drive); and
  • new median managed lanes.

A 4.0 km road widening from Finch Avenue to Highway 7:

  • from six to eight lanes between Finch Avenue to south of Steeles Avenue;
  • from four to eight lanes, from south of Steeles Avenue to Highway 7;
  • new median managed lanes.
Who is LINK427?

LINK427 was selected to undertake the extension and widening of Highway 427 by the Ontario Ministry of Transportation (MTO) and Infrastructure Ontario (IO).

The LINK427 team includes:

  • Developer: ACS Infrastructure Canada Inc. and Brennan Infrastructures Inc. (a member of the Miller Group of Companies)
  • Construction: Dragados Canada Inc., Brennan Infrastructures Inc. and Bot Infrastructure Ltd.
  • Design: WSP
  • Maintenance: ACS Infrastructure Canada Inc. and Brennan Infrastructures Inc.
How much will it cost?  

LINK427 signed a $616-million fixed-price contract with the Ministry of Transportation and Infrastructure Ontario to design, build, finance and maintain the Highway 427 Expansion. The contract includes a 30-year period starting with the opening of the highway, during which LINK427 will be responsible for the ongoing maintenance of the highway.

Where can I get more information about the Highway 427 Expansion Project?

LINK427 has established a “one-window” communication channel to address any questions, comments or issues. Contact us at ask@427expansion.ca or 1-888-352-8085. Des renseignements sont disponibles en français en composant 1-888-595-3152.

When will construction start?

The Highway 427 Expansion project is in the detail design stage. LINK427 is preparing necessary reports and documentation, in order to consult with regulatory agencies, to obtain clearance for vegetation removal which is anticipated to occur this winter

How will construction impact me?

LINK427 will consider how our activities affect local traffic and communities, provide advance notice of disruptions and always strive to be mindful of reducing the impacts of construction.

Updates about all temporary and permanent road closures and lane reductions will be posted on the website.

Each project and construction work zone is different.  Motorists need to drive in accordance with the conditions, anticipate changing conditions, stay alert, and remain in control of their vehicles at all times.  More information related to motorists travelling through construction zones is available at:




Was an Environmental Assessment conducted for the highway expansion?

The Highway 427 Transportation Corridor Environmental Assessment (EA) received approval from the Ministry of Environment and Climate Change (MOECC) in November 2010. The project was updated through completion of a Transportation Environmental Study Report (TESR) in 2016 to add additional lanes to the proposed Highway 427 extension.  A separate TESR was completed in 2013 for the widening of existing Highway 427 between Albion Road to Highway 7.

This project is being carried out in accordance with the approved environmental planning process for Group ‘A’ projects under the MTO Class Environmental Assessment (Class EA) for Provincial Transportation Facilities (2000).

What is a DCR?

Design and Construction Reports outline the project process, design details, results of the consultation process, construction staging and environmental impacts and mitigation measures.

Each DCR will each be made available for a 30-day public and agency review period and notices will be published in local newspapers, on the Project website and distributed by mail to those on the project contact list advising of the start of each review period and locations where each DCR will be available for review.

You can also contact us at any time via ask@427expansion.ca or 1-888-352-8085.

Des renseignements sont disponibles en français en composant 1-888-595-3152.

Will High Occupancy Toll (HOT) lanes be implemented on Highway 427?

On December 7, 2015, the Ministry of Transportation announced that the province will build new, dedicated HOT lanes with electronic tolling on Highway 427, from south of Highway 409 to north of Rutherford Road, which are anticipated to open in 2021.

For more information about HOT lanes, contact the Ministry of Transportation.

What are managed lanes?

Managed lanes are lanes within a highway that are different from the general-purpose lanes, their use governed by variables such as pricing, vehicle eligibility, and access control.

The Highway 427 Expansion project includes construction of the necessary infrastructure (i.e. conduit, footings, etc.) to enable managed lanes on Highway 427.  Once construction has been completed, the technology required to operate the managed lanes will be implemented under a separate contract.

For more information about managed lanes, contact the Ministry of Transportation.