Get all the road closures and details on the best way to get around on Sunday 25 April!
Roads along the marathon route and approaches will close at either 0700 or 0800 BST, with a staged reopening as the runners pass through; the first roads will reopen from 1100 BST.
As a general rule, most roads south of the river will open by 1400 BST, and by 1900 BST to the north.
Public transport will be free to race runners and officials on the Tube and DLR until 5pm, as long as you show your tabard or race number.
Charlton Way, Shooters Hill Road, Charlton Road, Little Heath, Charlton Park Lane, Artillery Place, John Wilson Street, Woolwich Church Street, Woolwich Road, Trafalgar Road, Creek Road, Evelyn Street (from 0800)
Surrey Quays Road, Salter Road, Brunel Road, Jamaica Road
Tower Bridge, The Highway, Westferry Road, Westferry Road, East Ferry Road, Marsh Wall, North Colonnade, Poplar High Street, Commercial Road, Byward Street, Upper Thames Street
Victoria Embankment, Birdcage Walk
If you're watching the race, there is severely restricted access to Cutty Sark because of ongoing restoration work, and the Greenwich Foot Tunnel will be closed between 1000 and 1200 BST.
Routes will be diverted or will stop short while the marathon is ongoing. Here are the routes affected:
1, 3, 11, 12, 15, 24, 25, 29, 42, 47, 51, 53, 54, 78, 87, 88, 89, 91, 96, 99, 100, 108, 115, 122, 129, 132, 148, 159, 161, 177, 178, 180, 188, 199, 202, 211, 225, 244, 277, 286, 291.
341, 343, 344, 380, 381, 386, 422, 453, 469, 472, 486, 507, C10, D3, D6, D7, D8, P12, RV1 plus the East London line replacement buses.
Here are the closures that will affect you on race day.
Bakerloo line - entire line closed
Circle and District lines - Blackfriars station closed
Metropolitan line - between Wembley Park and Rayners Lane and between Wembley Park and Northwood
Northern line - between Kennington and Morden
Piccadilly and District lines - eastbound trains will not stop at Ealing Common
Warren Street station - closed
Enhanced service throughout the weekend with trains on Sunday beginning at 0530 BST from Tower Gateway and Lewisham.
Services during the Marathon will operate as frequently as every 2½ minutes on the busiest sections of the route.
From 1600 BST, a normal Sunday service will operate until close of play at around 2330 BST.
You can board a river bus at Greenwich to Canary Wharf, Tower Millennium, London Bridge or Embankment Piers.
BBC London 94.9 coverage
Live from the Start at Blackheath with Kris Akabussi and Jo Good. They'll be speaking to runners as they prepare to set off.
Plus, Chris Wands and Steve Phillips will be live at the Marathon HQ on Tower Hill, bringing you regular updates on the Elite race and travel news throughout the morning.
1000 BST: We'll be at Canary Wharf (the 19 mile point) with Lesley Joseph and Simon Lederman. Throughout the morning the presenters will go live to our reporters out and about all around the course. Keep tuned in!
Follow travel updates on the day by tuning to BBC London 94.9 and on our twitter feed.
The BBC is not responsible for the content of external websites