Abstract: Records are produced describing how a passenger uses a transport system in relation to other passengers. A transport server (1001) receives (203, 401) an identifier of a requested drop-off point and determines (204, 205, 403, 407) an identifier of a requested pick-up point. It also determines (405, 413, 803) a list of stopping point identifiers, which list includes the identifiers of the requested pick-up and drop-off points and constitutes an itinerary for a transport vehicle. A list of those passengers is determined (804) that have requested transport in the same vehicle. For each passenger on the list of passengers, there is determined (801, 804, 901, 904) which passenger-specific group of legs between stopping points belong to the transport requested by that passenger, and calculated (802, 805, 806, 807, 808, 902, 904, 905, 906, 907) a record that represents the relation between the passenger-specific group of legs and those other groups of legs that are specific to other passengers.