A common UK road sign—a white circle with a thick black diagonal stripe—confuses many drivers, with online jokes claiming it means “national drifting zone” or “go
as fast as you want,” yet it simply indicates that the national speed limit now applies (30 mph in built-up areas with street lamps, 60 mph for cars on single
carriageways, 70 mph on dual carriageways and motorways, with lower limits for vans and vehicles towing trailers); the RAC confirms it overrides previous limits and reminds motorists that even when the national limit is in force, they must still drive safely according to conditions.**
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