Crosswalk Access - woven-planet/opensafety-mbse GitHub Wiki

Where can a Crosswalk start and end? “Anywhere” is not the answer since you would not expect to see a Crosswalk start on the road side and end just outside of the Passing Lane Position. Leading pedestrians to their likely demise is not really a Crosswalk goal. The answer isn’t “From one end side of the Road to the other” since that is too general. More to the point, sometimes a Crosswalk starts in one Road and ends in another. Sometimes a Crosswalk starts at the Road side and takes you to a bus stop in a Pedestrian Island, not fully crossing the Road.

We can clarify what is possible and what isn’t by defining legal Crosswalk Access points in terms of other elements of the road environment.

We can identify some of these elements in this picture:

images/crosswalk/crosswalk-access-10.png

So the answer to the original question is that a Crosswalk connects two different Crosswalk Accesses. A Crosswalk Access is the roadside (Road Segment), an Island or a Median. These are the only safe places for a pedestrian to enter or exit.

Identifiers

1. ID + Road segment

Note that the Road segment attribute is the union of the Road segment values in each of the subclasses.

Attributes

Location

The location relative to the Ego Vehicle. It is constrained such that no two Crosswalk Access’s of the same subclass and associated with the same Road Edge, Island or Median share the same Location value.

Type: Distance