Study Overview and Environmental Assessment Process

The Ontario Ministry of Transportation (MTO) has retained AECOM to undertake a Detail Design and Class Environmental Assessment (EA) Study for the rehabilitation of the Highway 401 eastbound collector lanes between Avenue Road and Warden Avenue in the City of Toronto. This study includes the reconstruction of new eastbound collector lanes to the south at the Leslie Street interchange and the reconstruction of 4 bridge structures at the following locations within the Leslie Street Interchange:

  • Highway 401 eastbound collector lanes over GO/Metrolinx tracks (37-206/1);
  • Highway 401 eastbound collector lanes over Leslie Street (37-208/1);
  • Leslie Street N-E ramp over Leslie Street (37-208/5); and
  • Highway 401 eastbound collector lanes over Don River East Branch (37-207/1).

Please note that while four structures are identified for reconstruction, these will be replaced with only three, as structure #37-208/5 will now be combined with structure #37-208/1.

The study also includes the rehabilitation of the Highway 401 eastbound collector lanes bridge over the ramp to the Don Valley Parkway/Highway 404 (37-322), pavement rehabilitation throughout the project limits, replacement of steel beam guiderail with concrete barrier, existing steel noise barrier replacement, highway safety improvements, drainage improvements, upgrades to illumination, replacement of traffic signals at the Highway 401 eastbound off-ramp to Bayview Avenue and improvements to the Advanced Traffic Management System.

This study is following the approved planning process for a Group ‘B’ project under the MTO Class EA for Provincial Transportation Facilities (2000). Upon completion of this study a Design and Construction Report (DCR) will be prepared to document the study process, recommended detail design improvements, consultation, and potential environmental issues and mitigation measures. Upon completion of this study, the DCR will be placed on the public record for a 30-day review period.

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