ANN ARBOR, MI -- Crews have begun working on the second phase of construction for Ann Arbor-Saline Road, closing off a segment of the road to traffic.

The first phase, between Oak Valley Drive and Lohr Road, was completed and reopened on Friday, Oct. 25, said Emily Kizer, Washtenaw County Road Commission spokeswoman. The second phase, between Lohr Road and the I-94 ramps, began on Monday morning, Oct. 28, and caused traffic delays.

The closure is expected to last three weeks, Kizer said. The intersection at Ann Arbor-Saline Road and Lohr Road, as well as the I-94 ramps, will remain open, she said.

“We have already adjusted some signage and we are adjusting traffic signal timing where we can,” Kizer wrote in an email. “Some of the signals are controlled by the City of Ann Arbor and we are working with them to make adjustments where they can.”

From Ann Arbor-Saline Road, crews suggest drivers head south to Oak Valley Drive, to Lohr Road, to eastbound Ellsworth Road, to northbound South State Street, to westbound Eisenhower Parkway and back to Ann Arbor-Saline Road.

“This is a long detour because we have to post an official detour that is appropriate for all vehicles, including trucks. We know local traffic will find other ways around the closure and the first couple of days of any major closure are usually the worst for drivers,” Kizer said.

Project updates can be found online.

Update: an earlier version of this story included a map with an incorrect detour route. It has been updated with the correct route.