98
TIL that blue reflectors on the road mean a fire hydrant is nearby.
(99percentinvisible.org)
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Rules
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