A 75-year-old woman died after her mobility scooter collided with a bus, police said.
Margaret Stoltz was riding along Hollway Road in the Stockwood area of Bristol on July 19 when the crash happened, shortly before 10am.
The pensioner, from Stockwood, was taken to Bristol Royal Infirmary, where she died later that day.
A spokesman for Avon and Somerset Police said: "We are keen to hear from anyone who may have information to help our inquiries.
"Anyone able to help is asked to contact the collision investigation unit on the force number 101."
The accident comes just weeks after the launch of a mobility scooter safety training scheme in Bristol.
Sue Rickell, chairwoman of Living Mobility told the Bristol Post earlier this month that "More and more people are purchasing mobility scooters and it is really important that there is a local centre that they can attend to ensure that they are safe to use them, but also recognises the safety issues of operating them on our pavements and roads"