Inner & outer lanes
Since road segments are rotationally symmetric there is no way of addressing individual lanes by using the terms left and right. Instead, the words inner and outer are used to refer to positions of lanes in relation to their underlying road segment.
- Inner lanes lie closer to the road center (e.g. closer to the lanes that support traffic for the opposite direction) where
- outer lanes lie closer to the road's exterior parts (e.g. where sidewalks are normally be located).
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