Trip Linking

This content is copied from Rulesy overview.docx [Needs update!!]

1. Concatenate 4 modes into a single text field (also concatenate transit_systems together, and transit_lines together); used in STEP 5.

2. Remove trip components into another table:

   • prior record does not end at home or work
   • trip purpose is either the same, or 'change modes'
   • duration between legs is either less than 15 minutes, or if purpose 'change modes', less than 30 minutes.
   • either there is a mode change, or both modes are transit

3. denote trip component which have aggregate properties that disqualify them as a single trip:

   • two instances of pool start, parking, park & ride, change vehicles
   • over 5 components
   • non-adjacent repeating transit lines (i.e. loop)

4. for legitimate linked trips, replace the initial component with the aggregate linked trip data

5. Recharacterize mode (including access/egress modes)

   • Eliminate adjacent repeated values
   • Characterize access and egress trips, separately for 1) transit trips and 2) auto trips. (Bike/Ped trips have no access/egress)
   • Remove access/egress modes from 1) transit and 2) auto trip strings--not only at the ends, but also the middle.
   • Split the concatenated field into separate mode fields

6. Split transit_lines and transit_systems into separate fields