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Examples of passable roads -

The City of Columbia defines streets as passable, that although the road may still be snow packed, at least one travel lane is accessible for a front wheel drive vehicle at speeds and driving conditions below the normal posted speed limits. Your vehicles condition and your driving skills also determine your ability to navigate roads defined as passable.

Passable two lane road in Columbia
Passable two lane road
This is a city street showing both driving lanes as plowed yet no pavement visible. This road meets the definition of passable.
This is a city street showing both driving lanes as plowed where patches of pavement are visible.
This road meets the definition of passable.
Passable two lane priority route
passable street with one lane plowed
This is a priority city street showing both driving lanes as plowed yet no pavement visible.
This road meets the definition of passable.
This is a city street with a single lane as
plowed yet no pavement visible.
This road meets the definition of passable.