The Michigan State Police is warning drivers to slow down as the roads are icy and slippery this morning around the state.

Multiple tweets from Michigan State Police Metro Detroit's verified Twitter account said the department has responded to approximately 100 crashes on city freeways and in nine townships since midnight.

"Our calls for service are through the roof. And one patrol car that was hit by a citizen that was driving too fast! Take it easy people," a tweet said.

The department also responded to multiple vehicle crash on Interstate 75 and Interstate 94, closing lanes. Lanes on I-94 east at Chalmers have reopened.

Authorities say icy roads were a factor in at least one fatal crash.

Chelsea Fire Department Capt. Chris Smyth tells MLive.com that a man died after crashing into a jackknifed semi on I-94 near Chelsea about 2:30 a.m. Wednesday. Smyth says the semi-truck had lost control due to slippery road conditions caused by ice and freezing rain.

The crash happened as icy roads were reported in a wide portion of the state during the morning hours. A number of school districts canceled classes for the day because of the road conditions.

The National Weather Service advised drivers are advised to be cautious when traveling on untreated roads, bridges, exit ramps and overpasses.

Associated Press contributed to this story.