And red ones mean you fucked up, big time.
We have some in BC, Canada that are lane markers. white/yellow on one side, red on the other. this way when you are in your proper lanes you see white/yellow, but if you are in the opposing lane the backs of them show red, so you know you shouldn't be driving into that lane
In the USA I assume, given that the person assumes everyone is from there too?
Looks like a UK article
The article goes into detail about various different countries, including the USA, UK, Australia, etc
This is for sure a thing in the US as well.
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