How do you derive trip purpose?

The Trip Purpose Metric provides the percentage of trips for each O-D pair or Zone that are between home, work, or other locations. The trip purpose Metric is only available for projects run with Location-Based Services data. Trip Purposes are provided as follows:

  • Home-Based Work (HBW): Travel between home and work in either direction.
  • Home-Based Other (HBO): Travel to or from home, to anywhere other than work.
  • Non-Home Based (NHB): All travel not to or from home (i.e. all travel other than the above)

In order to determine whether a device originates or ends a trip at home or work, we use our Home and Work algorithm. Devices in our LBS data sample are assigned a probable home and work location based on where they appear to spend evenings and weekday working hours. Devices can have a number of potential home and work locations and will be weighted accordingly based on where they spend the most time throughout a calendar month.

If a trip starts in any of the possible home locations and ends in any of the possible work locations, or vice versa, then it will be categorized as an HBW trip. In order to meet the criteria of an HBW trip, the trip must start in the same 100m x 100m grid as the determined home location, or within 100m of that grid and end in the same 100m x 100m grid as the determined work location or within 100 meters of that grid.

Home-Based Other (HBO) trips are those that start in the same 100m x 100m grid as the determined home location or within 100 meters of that grid and end in a non-work location, or vice versa. Non-Home Based (NHB) trips are those that do not start or end in or within 100m of the home grids described above.

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