The Michigan Department of Transportation says ongoing construction will lead to ramp closures this week along I-475 and I-69. Northbound and southbound ramps to eastbound I-69 will be closed from 9 p.m. to 5 a.m. beginning tonight and lasting through Friday. Motorists will be rerouted west on I-69 to the Hammerberg Road exit, then travel south to take the ramp to eastbound I-69.