R14

R14 / Generalization

Division Transition is a Soft Transition or Hard Transition

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The boundary between two Lanes is either an easily traversable painted or otherwise marked line or it is a physical boundary such as a cement barrier which may or may not also have a marked line alongside it. The key distinction here is whether or not it is physically possible to traverse the Lane Division without incurring serious damage.

For a soft (traverseable) Division Transition, there may be a variable crossing policy. When there is only paint on the road, there is always the option, legal or illegal of driving across the paint. For a Hard Transition, some sort of physical barrier is in place. In all such cases, there is no option since traversal is physically discouraged and therefore certainly illegal.

All Division Transitions serve the purpose of defining the condition of a Lane Division extending forward from some position with respect to the Ego Vehicle.

Formalization

<subclass>.(ID, Division, Road segment) -> Division Transition. (ID, Division, Road segment)