UK’s first full length motorway opens

5 December 1958

The Preston Bypass (now part of the M6) was the UK’s first motorway. Subsequently the M1 was the first full length motorway, opened to the public by the then Prime Minister Harold Macmillan on 5 December 1958.

Margaret Calvert, 2010, BBC, The Genius of Design – Better Living Through Chemistry

We were invited to the opening of the M1, and we had obviously special permission by the police to go on this motorway. It wasn’t open to the public at that point. It was a beautiful sunny day, blue skies, and then just us, no-one else on the motorway. Then we’d see our signs up, and we thought, “Wow!”. They just looked so good. They were big, and they sat there and they had their own presence. We just went on and on and on and on. We missed the turn-off or where the actual opening was, and I think we just ended at the end in a ploughed field. But we had a great day. And that’s probably a big moment in my life.

Above is The Secret Life of the Motorway (BBC, 2007). From 10:37 Margaret Calvert and Alice Rawsthorn each discuss the sign design.

The above video with plenty of examples of the type system was found through this article in The Telegraph by Andrew Roberts.