Car accessibility, Service area maps: To service locations, fixed-time arrival:

The TO service area for the fixed-time arrival contains all buildings from which a traveler, can reach at least one of the facilities buildings with a car arriving there at a given hour or before. 

The total duration of a trip cannot be longer than the given maximum travel time. 

If more than one of the facilities can be reached, the route to the destination that guarantees the closest to the given arrival time is stored.
  
