The short route connects the U.S. border with Highway 401 via the Thousand Islands Bridge. The section on Hill Island is a two-lane highway with limited development and two at-grade intersections, while the mainland section is a four-lane freeway with an interchange at the Thousand Islands Parkway in addition to its northern terminus at Highway 401. Connecting the two segments is a series of bridges between the Ontario mainland and Hill Island, which is a tolled in the southbound direction (northbound tolls are paid on the New York mainland). The entire route is located within Leeds and Grenville United Counties.