A road rage incident in Janesville has left the victim with a stab wound to the head.
Janesville police officers and firefighters were called by a driver Thursday who told them he had been stabbed.
Police say he had been driving when the 28-year-old suspect pulled in front of him and blocked the road.
The suspect got out of his vehicle, stabbed the victim, then drove off.
No names have been released.
The wounded man is expected to recover.
The suspect was arrested on tentative charges of first-degree recklessly endangering safety while armed, substantial battery while armed, disorderly conduct while armed, and some drug offenses.
