R18

R18 / Generalization

Bidirectional Lane is a Shared Single Road Lane or Center Turn Lane

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Two way traffic in a single Lane is inherently dangerous. Consequently, there must be very few cases where this is allowed. In fact, only two are known at this point. Either the road lacks a Conduit and there is no designated traffic direction or a special lane is designated for making turns across the roadway where traffic can approach from either direction.

Formalization

<subclass>. (Inside division, Outside division, Road segment) ->
    Bidirectional Lane. (Inside division, Outside division, Road segment)