The clean up is underway along U.S. 127, after an overturned tanker spilled thousands of gallons of liquid highway sealant all over the road.
Ingham County sheriff's deputies say 8,500 gallons of CPRE, which they describe as an emulsified complex petroleum hydrocarbon and water, when the tanker crashed around 5 a.m.
That left a little less than 2,000 gallons in the truck.
Much of the black liquid spilled on the highway, where it hardened. Some of it also went into the median on one side and a ditch on the other.
The county called an environmental clean up company to scoop up the contaminated soil and get the stuff off the road. They'll be working along with the Michigan Department of Transportation.
The sheriff's department identified the truck driver as Dennis L. Hebert, a 60-year-old from Macomb. He was treated for a minor injury at Sparrow Hospital and then released.
Investigators say he may have fallen asleep at the wheel. They do not believe alcohol was a factor in the accident.