Margaret Calvert: Sign of the Times

It would be no exaggeration to say that graphic designer Margaret Calvert has saved hundreds of lives on Britain's roads.  Born in South Africa in 1936, she worked with Jock Kinneir on the design of Britain's road and motorway signage system from 1957 to 1967.  Above is the picture she recently contributed to the Royal Academy Summer Exhibition 2010, adapting one of her road signs by replacing a man at