The union was founded in 1919 when the London and Provincial Union of Licensed Vehicle Workers merged with the Amalgamated Association of Tramway and Vehicle Workers.
It represented drivers of a wide range of vehicles, from buses and trams to cabs and horse-drawn carts.
It also recruited related workers, such as conductors, cleaners and farriers.
[1] Within the union, members of its predecessors were reluctant to merge their branches, with the tram and bus drivers coming into particular conflict.
Still, Ernest Bevin persuaded them to rejoin later in the year, shortly before the entire union became part of the new Transport and General Workers' Union.