1. TRB Planning Application Conference, May 2017
How to change transit surveys to make them more useful for a dynamic transit assignment model?
Andisheh Ranjbari, 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
Fast-Trips: Uses the trip-based hyperpath algorithm to find and evaluate paths, and then simulates transit passenger route-finding and user experiences.

3. Household Travel Survey
What We Had
On-Board Survey
Household Travel Survey
Years
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 O D
Access Mode
Mode
Agency
Route ID
Transfer
Mode
Agency
Route ID
Transfer
Mode
Agency
Route ID
EgressMode
First board
Last alight
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 O D
Access Mode
Mode
Agency
Route ID
Transfer
Mode
Agency
Route ID?
Transfer
Mode
Agency
Route ID?
EgressMode
First board
Last alight
Surveyed leg

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

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
Andisheh Ranjbari, Brice Nichols, Drew Cooper, Bhargava Sana, Elizabeth Sall