From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Leaflet demonstrating the functions of the Rolph Patent Automatic Traffic Warner.
| Identifier | ExFiles\Box 43\3\ Scan007 | |
| Date | 11th November 1921 guessed | |
| ROLPH PATENT AUTOMATIC TRAFFIC WARNER. Rolph's Automatic Traffic Warner illuminating Number Plate. Rolph's Automatic Traffic Warner signalling "SLOW" to vehicles following. Rolph's Automatic Traffic Warner signalling "STOP" to vehicles following. Rolph's Automatic Traffic Warner signalling "TURNING TO LEFT." Rolph's Automatic Traffic Warner signalling "TURNING TO RIGHT." | ||