Reflecting roadstud, c 1990s.
3 4 c m
actual image size: 32cm x 26cm

Reflecting roadstud, c 1990s.

© Science Museum / Science & Society Picture Library


The reflecting roadstud (commonly known as a cat's eye) was invented by British inventor Percy Shaw (1890-1976) to make night driving safer. Set into the road surface, they work on the principle of total internal reflection to bounce light from the headlights of oncoming cars straight back towards them, showing the way ahead.

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