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@vt @Doc Edward Morbius β I would argue that these signs add to the cognitive load.
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I would say that the practices in the country where this stretch of road is located play a very big role. For example, in the US, a lot of our highways have big ugly billboards along the roadside. Some of those are now the lighted electronic signs that flash and move. In that situation, some drivers may already be near their limit of mental processing.
We also have state highway departments running scrolling text signs to warn of temporary road conditions, AMBER alerts, and even sloganeering ("buzzed driving is drunk driving; if we catch you, you'll get a free stay in our hotel", "wear your seatbelt; click it or ticket", and so on). As much as I favor seatbelts and detest impaired driving, I really wish they would not distract drivers with their slogans.
On the other hand, in a nation where such tomfoolery is not allowed, a safety sign may be able to safely be placed in that location.
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"may" should be "may or may not"