When Jock Kinneir and Margaret Calvert designed the UK's road signs more than 50 years ago, they wanted their creations to be as clear as possible. For example, if they hadn't had their final say, place names on road signs would be written in all capital letters.
'The actual word shape was the most distinctive thing because if you had Birmingham in capitals, from a distance, it's difficult to read, but in caps and lower case you have word shape,' said Calvert in a BBC interview in 2011. 'That was fundamental.'
The resilience of their designs is testament to their effectiveness and, although constant small alterations and amendments are made, it's little surprise road signs are almost identical to the ones that flanked the UK's roads in the 1960s.
However, despite their iconic appearance, our road signs continue to flummox drivers – and that's not just the uncommon ones. Almost a third of motorists don't recognise the national speed limit sign.
So, how well do you know your highway code?
So, what does the future hold for Britain's road signs?
A 2018 AA survey of over 17,000 people found 88 per cent of drivers think roads are in a worse state now than 10 years ago, and motorists who fall foul of potholes consider they have no option but to make an insurance claim. It seems as though pothole-warning signs would be a pretty good idea.
Whether road signs get removed, replaced or created from scratch, you can be sure they'll be designed with the road user in mind, utilising Jock Kinneir and Margaret Calvert's famed iconography to maximum effect.