A 49-year-old Laurel man driving a motorcycle crashed Saturday evening at about 7:20 on the on-ramp to I-90 West near mile marker 447 from Laurel Road.
Billings Police Department Sgt. Neil Lawrence said the man, whose name hasn't been released, was unable to negotiate a turn and went off the roadway on the left side and crashed on the embankment.
He was transported to Billings Clinic with serious injuries. His condition was unknown as of Saturday night.
It appears that speed was a factor in the crash and it is unknown whether alcohol contributed. The incident is under investigation.