Two police officers have been served with misconduct notices after a 17-year-old girl died after fleeing a police vehicle, the watchdog has announced.
Tamzin Hall, 17, from Wellington, Somerset, sustained fatal injuries when she was struck by a car on the M5, between Taunton and Bridgwater shortly after 23:00 GMT on 11 November.
The Independent Office for Police Conduct said Ms Hall was handcuffed in the back of a police vehicle when it had pulled over for "safety reasons".
"Our investigation is in the early stages and we are working hard to establish the exact circumstances of what took place, from the time of Tamzin's arrest, to how events unfolded a short time later on the M5," said IOPC Regional Director David Ford.