Highway 401 Improvements
From 1 km East of Highway 16 to 2.5 km East of Shanly Road Preliminary Design Study and Class Environmental Assessment


Photo showing a stretch of Highway 401 approaching the Shanly Road overpass.

Project Overview

Welcome to the official site for the Preliminary Design and Class Environmental Assessment (Class EA) Study focusing on the replacement of Shanly Road Underpass, interchange improvements and establishing the footprint of Highway 401 for future six lanes, from 1 km east of Highway 16 to 2.5 km east of Shanly Road for approximately 10.1 km.  The Ontario Ministry of Transportation (MTO) has retained HDR Inc. (HDR) to undertake this study.

The study is to identify a Recommended Plan that addresses current and future needs for the provincial highway network. This study will include reviewing existing conditions, developing and evaluating alternatives, identifying appropriate improvements, and developing environmental protection/mitigation measures.   A Recommended Plan will be confirmed and designated (protected) at the completion of the study. The Study area falls within the Township of Edwardsburgh/Cardinal, United County of Leeds & & Greenville as shown in the key plan.

We will provide regular updates on this site with information, as well as project documentation, as it becomes available.

We welcome your feedback. If you have any comments or questions any time during this study, or wish to be added to our project mailing list, you can submit through the project website: Contact Us.

Key Plan