Due to the nature of our data sources, trips are defined in different ways:
- For Navigation-GPS (Personal and Commercial): A trip begins when the vehicle turns on. A trip "ends" when the device does not move more than 5 meters in 5 minutes. Additionally, if the vehicle turns off, the trip ends. A trip is also required to be at least 3 minutes and 500m in length.
- For Location-Based Services (All Modes): A trip starts when a device begins moving from a location where it was once still. Similarly, a trip ends when a device does not move at least 5 meters in 5 minutes. Additionally, a trip will end if there is a significant gap in pings seen from the device, or if the device is seen pinging within a fixed location for an extended amount of time with minimal movement. A trip is also required to be at least 3 minutes and 500m in length.
- For Location-Based Services (Bicycle and Pedestrian): When we encounter enough consecutive pings with a different set of modes than the modes of the trip in progress we conclude that the mode has changed. We then end the current trip and start the next trip with the new mode. In addition, if a device appears stationary for a fixed period of time, the trip will end.