Transport on a dye-line information sheet, 1967. Jock Kinneir, Margaret Calvert. Kinneir Calvert Associates. 50 years of British road signs: https://baselinemagazineblog.wordpress.com/2015/09/05/50-years-of-british-road-signs/
To celebrate our '50th Anniversary of the British Road Sign' project we asked Margaret Calvert to select five road sign designs (one for each decade) from the many that she originally produced in the 1960s.