I know the type of signs that you mean Bertj, an example that I can think of is on the A1 Northbound just after Team Valley, or southbound just before it.
They are positioned just before a semi-tight bend, saying maximum speed 40mph, but they are not in a red circle, are permantently there, and just after one of them is a NSL repeater sign! Needless to say they are universally ignored and most people go round the corner at an apparently safe 70mph.
Blue
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I suspect most advisory 'safe speed' limits are aimed at HGVs and other large vehicles, rather than cars?
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