Strict trips vs. Passthrough in O/D

Strict trips

Strict trips are those that began or ended in the Origin and Destination (O/D). Strict trips are the ones marked as "Start/end here only" in the UI. A strict trip will also likely pass through the Origin or Destination, but trips are only categorized as Passthrough if the vehicle does not stop at the Origin or Destination.

Passthrough

If an Origin or Destination are defined to have Passthrough behavior, the start of the journeys are considered at the road segment taken upon exit of the Origin and the end of the journey is taken at the first road segment upon entry of the Destination.

Passthrough analysis is only available for trips where the geography of interest is on-road. If the geography of interest is off-road, we cannot do a passthrough analysis.

Overlapping zones

If zones in an analysis overlap, a trip is defined for every applicable zone pair. This means a single physical trip may be counted multiple times in the final output.