For buyers contracting authority
Pick 48813100 when the contract is for the displays themselves, the boards, the at-stop signs, the in-vehicle panels, and the work to feed them live data. The line that trips contracting authorities is the parent: Passenger information system (48813000) is the right code for buying the whole system, including the central software and operations layer, while 48813100 is scoped to the display element of it.
The sibling is the second boundary. Real-time passenger information system (48813200) describes a real-time system as a whole, so reserve 48813100 for the bulletin-board hardware and its integration rather than the system that computes the predictions.
Where a single contract bundles boards with the surrounding system, set the primary CPV code by the dominant deliverable. If the displays are the main purchase, this code fits even when a data feed or minor software is part of the scope.