As soon as you leave the vehicle, you are required to end the trip by moving the slider in the app from right to left. As soon as you stopped a trip, the app will calculate the trip and its price. Once the ticket has been defined, you can start a new trip.
FAIRTIQ requires accurate location data to end your trip. If the system doesn't locate you, please make sure to 1) turn on WIFI on your smartphone and 2) go out of the building.
Please note that it isn't possible to end a trip in a moving vehicle.