Modal hierarchy is useful in being able to "name" the "main mode" that a person has taken when they have taken multiple modes to complete a trip.
An example modal hierarchy could be:
- Express Bus
- Local Bus
If an individual did the following to get from O --> D, using the hierarchy above, Subway would be the main mode, and the choice that this would fall under in the mode choice model would be Kiss and Ride to Subway even though the drop-off occurred at the express bus station.
- Got dropped off at bus station
- Express Bus to downtown
- Walked from bus station to subway station
- Took subway across town
- Walked from subway to destination