摘要: |
The Georgia Institute of Technology is currently performing research that will result in the development and deployment of three instrumentation packages that allow for automated capture of personal travel-related data for a given time period (up to 10 days). These three packages include: a handheld electronic travel diary (ETD) with Global Positioning System (GPS) capabilities to capture trip information for all modes of travel; a comprehensive electronic travel monitoring system (CETMS), which includes an ETD, a rugged laptop computer, a GPS receiver and antenna, and an onboard engine monitoring system, to capture all trip and vehicle information; and a passive GPS receiver, antenna, and data logger to capture vehicle trips only. The first two systems will be capable of capturing all travel activities that would normally be captured using manual travel diary or telephone survey methods. For each trip, this information includes vehicle or other mode identification, driver and passenger identification (for personal vehicle trips), trip purpose, start and finish time (or duration), origin location, destination location, and distance traveled. In addition to these traditional elements, route choice, functional classification of each link in the route, link-based travel speeds, and freeway traffic conditions can be determined by tying GPS data to a geographic information system (GIS) database and real-time advanced traffic monitoring system, greatly enhancing the original data collected. The CETMS will also collect all vehicle and engine operating conditions affecting emissions that can feasibly be captured via an onboard engine computer monitor--on a second-by-second basis. These data include such variables as vehicle speed, acceleration, engine revolutions per minute (rpm), manifold absolute pressure, throttle position, catalyst temperature, gear selection, air/fuel ratios, and coolant temperature. The third system, the passive GPS receiver and antenna, will be used with a subset of the household sample employing traditional paper diary methods. The GPS data will be used to compare actual versus reported trip data, allowing for the development of under-reporting and misreporting correction factors. Upon completion of prototype testing and data collection in the summer of 1999, 27 ETDs with GPS, 27 passive GPS systems, and 5 CETMSs will be procured and assembled for use in the 1999-2000 Atlanta Regional Household Travel Survey. The targeted sample size for the regional survey is 4,000 households. |