1940's 'Road Junction' road sign, incorporating Cataphotes, better known as 'cats-eyes'.
These were produced in high volume during WW2, as they provided a the perfect solution for hazard signs which were effective during the black-out of an enemy air-raid.
 
Dimensions: w26 x h48cm
 
Percy Shaw, OBE (15 April 1890 – 1 September 1976) was an English inventor and businessman. He patented the reflective road stud or "cat's eye" in 1934, and set up a company to manufacture his invention in 1935.
 
source: https://en.wikipedia.org/wiki/Percy_Shaw