If you change from one line to another without interruption (e.g. stopovers that take less than 20 to 30 minutes), you won't be required to stop your trip. FAIRTIQ will recognise that you changed line and calculate the optimal fare.
For longer interruptions, we recommend to stop the trip temporarily. When you resume travelling, simply start it again. This has no influence on the calculation of the price. The system calculates automatically all trips and computes the cheapest ticket combination possible.