Frognal Corner is the junction between Chislehurst Road and the Sidcup Bypass.
The Sidcup Bypass was part of a major upgrade of the London to Folkestone route and it opened in 1926.
It was soon very popular, causing difficulties for traffic crossing from Sidcup to Chislehurst. The result was a very early example of traffic lights.
This site is unrecognisable today, with the six lane A20 burrowing under the A222.
