Duluth, MN (NNCNOW.com) --- Motorists traveling on Interstate 35 will face lane closures and detours on March 21. Drivers on northbound I-35 in Duluth will be restricted to a single lane from 9 a.m. to 3 p.m. while crews install a new changeable message sign on the Garfield Avenue Bridge. The northbound I-535 to northbound I-35 ramp will also be closed during the same time. Motorists traveling on Duluth- bound I-535 will be detoured to 21st Avenue West and back to northbound I-35. If it rains or snows heavily on March 21, the lane closures and detours will take place on Friday, March 22 instead. Written and posted to the web by Raeanna Marnati RMarnati@kbjr.com