The target time for the passenger to arrive. Is within the arrival time window. In trips with more rigidity surrounding the arrival time (i.e. commutes to work), the preferred arrival time is often used for finding a backwards shortest path to the origin.

The target time for the passenger to depart. Is within the departure time window. In trips with more rigidity surrounding the departure time (i.e. commuting home from work), the preferred departure time is often used for finding a forward shortest path to the destination.