More than 14 thousand runners have begun the Bristol half marathon. They set off in two waves at 0930 and 1000.
The numbers are up from last year, with five thousand more people competing. The 13 mile long race is in it 24th year. Thousands have lined the city's street to show their support.
There are warnings that many roads in the city will be closed for much of Sunday.
More top news
Helen has the forecast for Devon, Cornwall, Somerset and Dorset.
Helen has the forecast for Bristol, Wiltshire, Somerset, Gloucestershire and Dorset.
Figures obtained by ITV News West Country show that drivers in Plymouth spend over two working days a year stuck in gridlock in the city.