A body in existence 1924-1965 to advise the Minister of Transport on issues relating to traffic and transport in the London Traffic Area.
The Wikipedia page, with a list of participants, is 
- 1924-33: Sir Henry Percy Maybury
- 1933-37: Sir Henry Jackson MP
- 1937-46: Harry Sheil Elster Vanderpant (knighted 1939)
- 1946-61: Alexander Samuels (knighted 1963): nicknamed "Mr Traffic"
- 1961-65: Albert Charles Dennis
Some information here