There will also be 30 seconds applause before the race in memory of last year s winner Kelvin Kiptum, who died in a car accident in February at the age of 24.
30-second applause before start of record London Marathon walesonline.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from walesonline.co.uk Daily Mail and Mail on Sunday newspapers.
Miles of road closures have been put in place and security railings put up around the 26.2-mile route which will see 50,000 professional and amateur runners take part.
Moment Hardest Geezer crosses the finish line at the London Marathon dailymail.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from dailymail.co.uk Daily Mail and Mail on Sunday newspapers.