GPS Leader™ In-vehicle Data Collection Ben Pierce By

Acknowledgements for Ohio Department of Transportation Data Greg GiaimoJesse Casas

Page 3 Kentucky Traffic Model Users Group: Travel Survey Workshop Presentation Outline  Battelle and GPS  Technical Review of GPS Leader™  Uses of GPS Leader™  Equipment Costs  An Illustrative Example: Results from a Recent Study in Ohio

Page 4 Kentucky Traffic Model Users Group: Travel Survey Workshop Battelle and GPS  Battelle conducted one of the first GPS studies, as a trial case on behalf of FHWA, in Lexington, Kentucky in  Current GPS Leader™ equipment was developed by Battelle as a result of this trial  To date, have collected GPS data from ~700 homes using GPS Leader™ equipment

Page 5 Kentucky Traffic Model Users Group: Travel Survey Workshop Battelle’s GPS Leader™ Main Unit: Integrated GPS, Data Storage, & Power Management Palm OS Handheld Device (User Interface) GPS Antenna Package Includes:  Main unit  Palm OS PDA  GPS antenna  Cables  Software for downloading and managing data  Documentation and video

Page 6 Kentucky Traffic Model Users Group: Travel Survey Workshop Features of GPS Leader™  Time to fix <2 minutes cold start, <45 seconds warm start, <20 seconds hot start  Data collected: (every second or less often) –Via the GPS receiver… vehicle location in latitude & longitude travel speed –Via the handheld user interface… driver/occupants and trip purpose data intersection or delay data  12 MB on-board memory, stores 5 to 7 days of detailed trip data for later download –Approximately 70 hours at the one-second level

Page 7 Kentucky Traffic Model Users Group: Travel Survey Workshop Using GPS Leader™ for Household Travel Surveys  Can be used to actively (via PDA) or passively (via ignition sensing) to collect trip information (or a combination of both)  Battelle has mostly used a combination of active and passive trip detection

Page 8 Kentucky Traffic Model Users Group: Travel Survey Workshop Household Travel Surveys: Entering User Supplied Data  Turn on vehicle, then PDA  Press ‘START’  Never need to enter data while vehicle is in motion

Page 9 Kentucky Traffic Model Users Group: Travel Survey Workshop Household Travel Surveys: Entering Data  Select driver from pre- populated list  Select any passengers, if any, from pre-populated list  Stow PDA and begin driving

Page 10 Kentucky Traffic Model Users Group: Travel Survey Workshop Household Travel Surveys: Entering Data (cont.)  Stop vehicle and select ‘END TRIP’  Select trip purpose for each occupant (will vary for each survey)  Indicate whether you are at your final destination or an intermediate stop

Page 11 Kentucky Traffic Model Users Group: Travel Survey Workshop Household Travel Surveys: Entering Data (cont.)  For intermediate stops, indicate whether –there is a change in driver –you picked up a passenger –you dropped off a passenger  Otherwise, device is ready for next trip

Page 12 Kentucky Traffic Model Users Group: Travel Survey Workshop Equipment Costs  Purchase Price = $1,650 –GPS data collection and storage unit –GPS receiver –Handspring Visor PDA –PDA user data collection software –Data and power cables –GPS Leader Data Management Software –User documentation  Lease Program  Fee-for-Service option Lease Cost MonthMonthlyTotal 1$350 2$300$650 3$250$900 4$250$1,150 5$200$1,350 6$200$1,550 7$150$1,700

Page 13 Kentucky Traffic Model Users Group: Travel Survey Workshop Uses of GPS Leader™ Other Than Household Travel Surveys  Travel Time Studies  Vehicle Activity Surveys (e.g., Commercial Truck Surveys)  Emission Modeling and Duty Cycle Studies  Fleet Performance / Operations Analysis

Page 14 Kentucky Traffic Model Users Group: Travel Survey Workshop Ohio Results: Methods  Used Combination of active and passive data collection (i.e., automatic trip detection and collection of trip information from user)  GPS self-installed/uninstalled by respondent  Diary retrieval was a separate process from GPS

Page 15 Kentucky Traffic Model Users Group: Travel Survey Workshop Why GPS?

Page 16 Kentucky Traffic Model Users Group: Travel Survey Workshop Ohio Results  On average, participants of the GPS study reported 1.3 – 1.6 times more person and vehicle trips during their diary interviews than did the main survey participants  Overall, there were roughly 8 percent of trips that were identified by GPS but were not reported in the diary

Page 17 Kentucky Traffic Model Users Group: Travel Survey Workshop Ohio Results (cont.)

Page 18 Kentucky Traffic Model Users Group: Travel Survey Workshop Ohio Results (cont.)

Page 19 Kentucky Traffic Model Users Group: Travel Survey Workshop Ohio Results (cont.)

Page 20 Kentucky Traffic Model Users Group: Travel Survey Workshop Questions?