A record number of people will take to the streets of Lynn this weekend for the Grand East Anglia Run (GEAR) and Mini GEAR races, organisers have announced.
More than 3,000 people have signed up to take part in Sunday’s events, forcing organisers to close entries for the first time ever.
And officials have revealed they will be looking into whether the number of participants can be increased in the future.
Race director Roger Partridge said: “The response this year has been extraordinary. Entries were high even before we launched the event and that trend just continued.
“It’s brilliant. I’m really looking forward to it. The atmosphere is going to be incredible.”
As well as the races themselves, there will be live music at several sites around the town centre, including the Tuesday Market Place, where the race starts and finishes.
The square will be closed to traffic between 8am and 2pm, while other roads around the town centre will also be shut from 9.30am ahead of the start of the race at 10am.
Affected roads include King Street, Queen Street, Church Street, Stonegate Street, Millfleet, the South Quay and London Road, while, after 10.15am, Wisbech Road will only be open to traffic leaving the town.
This year, for the first time, the event has been organised by Alive Leisure, the trust which took over the running of sport and leisure facilities from West Norfolk Council last year.
More than 100 volunteer marshals will be around the course and trust chairman Peter Lemon said it has been “a real eye opener” to see the level of community involvement in staging the race.
He said: “It’s a fantastic event and I am sure that everyone’s efforts will be rewarded on the day by the superb support of the many spectators that will turn up to spur the runners on their way.”
Keyvan Djamarani, managing director of sponsors Bespak, said: “Watching this event develop and grow and knowing that we have been part of that is a real honour.
“I hope everyone has a fantastic day, whether they are running the race or cheering the runners on.”
For full details of the road closures that will be place during the event, visit www.grandeastangliarun.co.uk.