Police investigating fatal M5 pile up

The transcript covers the investigation into a tragic accident on the M5 motorway, where a fireball incinerated vehicles, leading to seven deaths and 51 injuries. The investigation focuses on the nearby Taunton Rugby Club's firework event, which may have caused significant smoke, reducing visibility. Details of the victims, including Michael Barton and his family, are shared. The inquiry involves major crime teams and road policing units. Transport Secretary Justine Greening visited the scene to assess safety concerns. The community is in shock, and the investigation is ongoing.

What actions did the transport secretary take following the incident?

What implications could the investigation have for the Department for Transport?