i'll admit i almost responded to the implication that the bike lane wasn't part of the road, it hadn't even occurred to me that there was a metaphysical problem here. if the road is unknown, is the status of the existence of the bike lane a known unknown!?!?

We also know there are known unknown bike lanes; that is to say we know there are some bike lanes we don't know. But there are also unknown unknown bike lanes - the ones we don't know we don't know. It is the latter category that tends to be the dificult ones.