Avon & Somerset Police are appealing for spectators with video or photos of the fatal accident to contact them.
The crash happened as 23-year-old cyclist Junior Heffernan came round a bend during the Severn Bridge Road Race.
Here is Acting Inspector Darren Jarvis...
More top news
Ambulance staff in our region are facing serious injury or even death following a dramatic rise in the number of assaults they've suffered.
A skateboarding prodigy from Bristol has appeared in a new film which showcases the city.
A supersonic car being built in Bristol is a step closer to breaking the world land speed record, after a new sponsorship deal.