[Tagging] lanes=-1 especially in Canada

[Bryce Nesbitt]

I rolled the map-roulette wheel, and found a series of highways in Canada
marked with "lanes=-1", all part of a CANVEC import.

I see 17,943 uses of this value: it's less popular than 5 lanes but more
popular than 6.
What does it mean, if anything?
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