The flashing globes on UK Belisha beacons are amber.
A Belisha beacon is a yellow or amber globe mounted on a tall post, usually painted in alternating black and white bands. It marks the ends of a zebra crossing and helps drivers spot the crossing, particularly in darkness or poor visibility. The globe’s flashing colour is distinct from the red, amber and green signal sequence used at traffic lights.
The beacon was introduced in Britain in the 1930s and named after Leslie Hore-Belisha, the Minister of Transport who promoted pedestrian-safety measures. Following the Road Traffic Act 1934, beacons were rolled out nationally in 1935. The familiar black-and-white zebra markings came later, in 1951.
A useful distinction is that “amber” describes the yellow-orange light, not the black-and-white pole. In Britain, a standard zebra crossing generally requires two beacons, one at each end, although arrangements can vary where there is a refuge island. Modern crossings increasingly use LED rings or illuminated posts, but the traditional colour remains amber.