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Improving Transit Surveys for Dynamic Assignment Models

Learn how to make transit surveys more useful for a dynamic transit assignment model, including converting raw data, running Fast-Trips, and comparing routes.

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Improving Transit Surveys for Dynamic Assignment Models

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  1. How to change transit surveysto make them more useful for a dynamic transit assignment model? AndishehRanjbari, Brice Nichols, Drew Cooper, Bhargava Sana, Elizabeth Sall TRB Planning Application Conference, May 2017

  2. What We Wanted Is Fast-Trips finding observed routes and assigning reasonable probabilities to them? Route and performance data for various user-classes to validate: • Feasible and likely mode, route, and transit trip combinations • Access/Egress times and distances • Transit path performances

  3. What We Had Household Travel Survey On-Board Survey • Years 2012-2014 • By 16 Transit Agencies in the Bay Area: BART, Caltrain, Muni, AC Transit, ACE, Napa Vine, SamTrans, Golden Gate, Tri-Delta, County Connection, VTA, Soltrans, Sonoma County, Petaluma, Santa Rosa, Union City • California Household Travel Survey • 2013 • GPS data for 10% of the sample (~10k people) for 3 days • GPS data for ~600 people in the Bay Area

  4. Desired Process Survey Raw Data Convert to Fast-Trips Demand (Dyno-demand) Convert to Fast-Trips Routes (Dyno-path) Run Fast-Trips and produce outputs (Dyno-path) Developed performance metrics and targets Compare the routes (Tableau or iPython notebook)

  5. On-Board Survey:What Was Hard/Impossible • Departure/Arrival time in HH:MM format • Stop ID and Route ID • Transfers Info HH:MM Lat/lon Stop ID HH:MM Lat/lon Stop ID HH:MM Lat/lon Stop ID HH:MM Lat/lon Stop ID HH:MM Lat/lon Stop ID HH:MM Lat/lon Stop ID HH:MM TAZ HH: MM TAZ D O EgressMode Mode Agency Route ID Mode Agency Route ID Mode Agency Route ID Transfer Access Mode Transfer Last alight First board Surveyed leg

  6. On-Board Survey:What Was Hard/Impossible Available • Departure/Arrival time in HH:MM format • Stop ID and Route ID • Transfers Info Partly Available Missing HH:MM Lat/lon Stop ID? HH:MM Lat/lon Stop ID? HH:MM Lat/lon Stop ID? HH:MM? Lat/lon? Stop ID? HH:MM? Lat/lon? Stop ID? HH:MM? Lat/lon? Stop ID? HH:MM? TAZ HH: MM TAZ D O EgressMode Mode Agency Route ID Mode Agency Route ID? Mode Agency Route ID? Transfer Access Mode Transfer Last alight First board Surveyed leg

  7. HH Travel Survey GPS: What Was Hard/Impossible Available • Origin/Destination • Access/Egress vs Transfer links • TAZ and Stop ID • Agency and Route ID Partly Available Missing Dest? HH:MM Lat/lon TAZ ? HH:MM Lat/lon Stop ID? HH:MM Lat/lon Stop ID? HH:MM Lat/lon Stop ID? HH:MM Lat/lon Stop ID? HH:MM Lat/lon Stop ID? HH:MM Lat/lon Stop ID? Origin? HH:MM Lat/lon TAZ ? Mode Egress ? Mode Agency Route ID? Mode Agency Route ID? Mode Agency Route ID? Mode Transfer ? Mode Access ? Mode Transfer ?

  8. Conclusions and Lessons Learned • Yes, by substantial data wrangling,using info from transit operators, linking observed data with other existing datasets, and applying reasonable assumptions, valuable data can be extracted from the surveys. • But, to take advantage of survey data to use for Fast-Trips, in addition to the common info, it would be beneficial to have: • Departure/arrival time in hour-minute format • Stop and route info for all transfers • Supporting info from surveyors: route ID, stop, survey time in HH:MM format

  9. Thank You! fast-trips.mtc.ca.gov AndishehRanjbari, Brice Nichols, Drew Cooper, Bhargava Sana, Elizabeth Sall

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