This weekend, Saturday 29 and Sunday 30 July, there will be significant impact to travel as a result of the weekend of Prudential RideLondon cycling events. Certain roads and river crossings in east, central and southwest London and Surrey will be closed to traffic.
Roads

There will be extensive road closures on and around the routes; roads will be closed from early morning and will re-open when it is safe to do so. Pedestrian access to properties will not be affected. A number of bridges in London and Surrey will be closed at times over the weekend. Road users are advised to avoid areas near the event route wherever possible.
Public transport

Most of the network will be open with services running as normal, but please check before you travel as some essential upgrade works are taking place. While we will try to maintain a good service, many buses will be on diversion or will stop short of their destination, and some may be affected by traffic displaced by road closures.

For more information about the event please see https://www.prudentialridelondon.co.uk/about/faqs/  and the Transport for London website