Illinois Route 17 is a rural, arterial east–west state highway that runs east from a former ferry crossing in New Boston along the banks of the Mississippi River to State Road 2 west of Lowell, Indiana. It is 209.40 miles (337.00 km) long.

Dwight is a village located mainly in Livingston County, Illinois, with a small portion in Grundy County. The population was 4,032 at the 2020 census. Dwight contains an original stretch of U.S. Route 66, and from 1892 until 2016 continuously used a railroad station designed in 1891 by Henry Ives Cobb. Interstate 55 bypasses the village to the north and west.