GREEN BAY, Wis. - This happened just before 5:00 p.m. Monday on Main Street at the intersection of Grove Avenue.
Police say a motorcycle was traveling westbound on Main St. when it failed to negotiate a curve in the road and hit the north curb line. The driver was thrown from the motorcycle.
According to police, the driver is a 47-year-old Green Bay man. He was not wearing a helmet and suffered serious head injuries. Police say he was taken to a local hospital by Green Bay Metro Fire Department.
If anyone has information concerning this case, please call the Green Bay Police Department at (920) 448-3208 reference case number 18-204678.