Excerpts from ab7chicago.com:

Part of I-355 was closed after a plane landed on the Tollway near New Lenox Thursday morning.

Illinois State Police responded after a small white Beechcraft aircraft made an emergency landing in the southbound lanes of I-355 due to unknown mechanical issues.

Four people were on board the plane at the time of the emergency landing including the pilot and three young women, ages 15, 20, and 21, all from Wilmington, Illinois. Three of the four people are being treated for back injuries and undergoing other medial checks at Silver Cross Hospital.

small plane on the interstate highway

Larry Shapiro photo

From ISP District 15 on Twitter:

Small plane lands on I355 SB near Route 6 in New Lenox, IL 5/13/21

From ISP District 15