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Originally to push any HGV trailers back onto the road if they cut the corner [0]. They also work really well at beaching drivers looking at their phones who would have otherwise mounted the pavement.

[0]: https://www.youtube.com/watch?v=6FiV023ktLM




Here, HGV is probably "heavy goods vehicle" [1]. TIL etc.

[1]: https://en.m.wikipedia.org/wiki/Large_goods_vehicle




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