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OffroadCondition clarification

Describe the problem

For us some aspects regarding the general meaning and the evaluation of the OffroadCondition are unclear.

Describe your research

The OpenSCENARIO V1.2.0 Model Documentation mentioned that the OffroadCondition "Checks if an entity is of[f] the road. The logical expression returns true after the entity has been offroad for a specific duration." However, I cannot find any specification on the reference point of the entity used to evaluate whether the entity is off the road or not.

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  1. So my basic question is which reference point should be used for the evaluation whether an entity is offroad. For me two cases would make sense: Either one could use the entity's origin or the entity's bounding box e.g. as it can be used for the DistanceCondition with the freespace parameter.
  2. Furthermore, I have another question regarding the general meaning of the term offroad: Do non-drivable lanes have any effect on the condition. E.g. is a vehicle on a side-walk considered to be offroad?

Thank you very much for your help in advance!