Waldshut-Tiengen (dpa / lsw) – A man left the road with a motorcycle and crashed into a traffic light pole. He then fell and was seriously injured, the police said on Sunday morning. A rescue helicopter brought the 30-year-old to a Swiss hospital. It was initially unclear how the accident happened on Sunday night in Waldshut-Tiengen. The police are investigating whether the driver’s inability to drive or excessive speed could have been the cause of the accident. According to the police, the motorcycle was not allowed to be driven.