The measurement - in real time, of vehicle occupancy for buses is not something that has been carried out regularly or, is in widespread use in the UK. The rail industry has more experience in it and is currently experimenting with providing information to the public.
This means that there is little experience in managing vehicle occupancy data within the bus sector.
The current requirement for social distancing has resulted in significant interest in providing information to customers on vehicle occupancy - as one way of encouraging trust in the safety of public transport.
This document sets out how it is possible to communicate vehicle occupancy between systems in a standardised manner.