A road sign in the UK has been causing confusion among drivers, sparking a lively discussion online. The sign in question is circular with a white background and a thick black diagonal stripe running through it. Although it appears on the mandatory driving theory test, many motorists admit they forget its meaning once they’ve passed, leading to uncertainty on the roads.

This sign represents the national speed limit. From that point onward, the maximum legal speed depends on the type of road and vehicle. For standard cars, the limit is 60 mph on single carriageways and 70 mph on dual carriageways or motorways.

Larger vehicles or those towing trailers must follow lower limits: 50 mph on single carriageways and 60 mph on dual carriageways or motorways.

In urban or built-up areas with street lighting, the default speed limit remains 30 mph, unless otherwise indicated by signs. While some drivers joke online about the sign’s meaning—offering humorous interpretations like “drive as fast as you like”—road safety organizations remind motorists that this sign does not mean unlimited speed.

It simply indicates that the national speed rules are in effect, and drivers must always adjust their speed according to conditions such as traffic, weather, and road quality.

Experts emphasize that understanding road signs is vital for safety. Organizations like the RAC encourage continuous driver education, noting that even experienced motorists benefit from refreshing their knowledge. By staying informed and practicing safe driving habits, road users can help reduce confusion and make travel safer for everyone.