Motorists around Stubbington and Titchfield are being warned to expect traffic delays next Sunday, as the 25th Stubbington 10k road race takes place.
Roads will be closed to let the 1,800 runners take to the streets.
Diversions have been put in place, but according to race director, Gary Littlecott, disruption to traffic should be minimal.
'We have notified business and homes along the race route, and signage has been put up by the AA to notify motorists of the road closures,' he said.
The race starts on Titchfield Road in Stubbington at 10am on Sunday, and the B3334 road from Stubbington to the A27 roundabout will be shut for about an hour from 9.30am to 10.30am.
As the race passes, there will be rolling road closures along Bridge Street and Coach Hill in Titchfield, and down Posbrook Lane, from the village to the Meon Foreshore.
Titchfield should be clear of all runners by 10.45am.
The race itself is due to begin at 10am.