A stone thrown from a bridge over the A2 motorway near Castrop-Rauxel in North Rhine-Westphalia left a fist-sized indentation in the windscreen of the car, the police said on Thursday.
The incident, which occurred late on Wednesday evening, left the driver shaken but remained uninjured. The authorities are now investigating what appears to be a copycat crime.
A 33-year-old mother of two was killed on Sunday when an unknown person threw a wooden block from a motorway bridge. The block crashed through the windshield and hit the woman, who was sitting in the passenger seat.
The perpetrator, who is now wanted for murder, fled the scene on the A29 motorway near Oldenburg in the German state of Lower Saxony. He is wanted for murder.
According to the police, a similar incident occurred along the same stretch of the A29 several years ago when a stone crashed through the window of a moving vehicle. That time, there were no injuries as no one was sitting in the passenger seat.