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 from Yelverton in Devon came round a bend during the Severn Bridge Road Race.
Here is Acting Inspector Darren Jarvis...
More top news
A Cornish Royal Navy winchman, who risked his life to save five French fisherman, has been awarded the Queen’s Gallantry Medal.
Newquay could be home to Europe's first spaceport, paving the way for commercial space travel in the UK.
A Bowhead whale - almost never seen south of the Arctic - was spotted by a diver just off Par Beach on St Martin's island.