Updated at 6:42 p.m.: Carpenter Road south of Packard closed for accident investigation

Huron Valley Ambulance spokeswoman Joyce Williams said the driver of the motorcycle has been taken to St. Joseph Mercy Hospital in critical condition. Ambulance crews were dispatched to the area at 3:45 p.m., Williams said.

Further information about the man's injuries could not be released, Williams said.

Department of Public safety officials encouraged drivers to use alternate routes around the area.

Pittsfield Township fire and police officials were not able to comment on what the accident was Thursday afternoon. Pittsfield Township dispatchers and Huron Valley Ambulance dispatchers refused to comment on the nature of the accident Thursday.

Pittsfield Township Fire Chief Sean Gleason said the man had leg and head injuries in a voicemail to AnnArbor.com Thursday afternoon.

Update: According to Pittsfield Township Police Chief Gordy Schick, a vehicle pulled out in front of the 44-year-old Pittsfield Township man, who was heading home at the time. The motorcyclist was wearing a helmet.

"I think his helmet saved his life," Schick said.

As of 6:42 p.m., Carpenter Road was still closed while police investigated the accident. Schick said he expected the road to open up soon, though.

Check back to AnnArbor.com for details on this incident as they become available.

Crime reporter John Counts contributed to this report.