The 61-year-old Muskego man was killed Sunday morning after hitting a tree near Coral Drive and Highway 164.
The driver, who was pronounced dead at the scene, was Dale A. Kolter, according to Capt. Ron Oremus.
No other people were involved in the crash, according to the Waukesha Police Department. The accident was reported at 9:44 a.m.
Police are continuing the investigation, but early indications show speed was a factor.