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I didn’t read the original paper yet, perhaps it’s there, but it isn’t in the linked article nor its source Ars Technica article. Can authors themselves upload their papers to these archives, and if so, how to do it correctly to make it findable both by DOI and other means? Does anyone know?
I relatively often meet 4 of these:
no speed limit (use the normal limit for this type of road)
car tires may defy laws of nature (slippery road, usually followed by a sign saying it applies during rain)
speed camera ahead
no water polluting goods (not very common, but occasionally comes up. There is also no dangerous materials with an orange trapezoid instead of an ellipse)
I also saw don’t drive off the pier (around ferries), watch for skiers (in the mountains with cross-country skiing routes), and warning about planes, although in different design (around airports).