With a sharp increase in both car ownership and traffic accidents during the 1920s, it became apparent that further regulation of road users was required. The 1930 Road Traffic act paved the way for many changes, including standardisation of road sign-age.
The illustration below comes from the pages of a 1930s road atlas supplied by the Co-operation Wholesale Society, showing some of the new signs. Included is the Belisha Beacon, introduced by Leslie Hore-Belisha, who became Minister for Transport in 1934. A further review of road signs took place in the 1960s, chaired by Sir Walter Worboys, resulting in a new generation of signs suitable for the motorway age. Although the old ones have been largely swept away, some still survive, particularly those giving local directions. These seem to be generally known as 'pre-Worboys'. The lower picture is of an old ring-top directional sign in the Lincolnshire village of Syston, taken in March 1991.