The widening of HW 175 between Quebec City and Saguenay (between km 53 and km 227) in 2006-2012 was one of the largest road expansion projects in Canada. The surrounding area is made up mostly of natural  territory that provides important habitat for various wildlife species. The expansion corridor runs through the Reserve Faunique des Laurentides with a large section adjacent to 
the Parc National de la Jacques-Cartier. The new road is approximately 3 times larger than before, growing from 30-35 m to 90-100 m wide and the gap in forest cover is often even significantly wider. Many studies from Europe, North America and Australia have shown that a number of species use wildlife passages successfully. However, most research has been focused on large mammals, leaving a gap of information about small to medium-sized mammals. Although smaller, these animals can also pose a risk to drivers when they cross the road, causing drivers to swerve or lose control of their vehicle. Thus, this research project will determine whether the passageways are effective for medium-sized and small mammals and whether further road management is needed. The effectiveness of the mitigation measures for large mammals along HW 175 has been studied in separate projects. This
four-year project will provide important information for adaptive management and long-term monitoring of road mitigation.