A self-driving bus was involved in a collision with a tram on its first day of carrying passengers in the Swedish city of Gothenburg on Monday, raising questions about the safety of autonomous public transport systems.

The automated bus braked suddenly and was struck from behind by a tram in central Gothenburg. No injuries were reported among passengers or other individuals involved in the incident.

Vasttrafik, the public transport company operating the service, immediately removed the bus from service for inspection following the 25 May crash.

Patrik Chi, spokesman for Vasttrafik, confirmed the incident involved a self-driving bus with passengers onboard. “The self-driving bus with people onboard in Gothenburg braked and was hit from behind by a tram. There are no casualties or personal damages,” he said.

The bus had been circulating in the Swedish city since the end of March, but Monday marked its first day transporting members of the public. A human driver was present on the vehicle with the ability to take control if necessary.

Sweden’s Transportstyrelsen transport agency had authorised the bus to carry passengers as part of a trial scheduled to run until 31 July 2027.