Bus routes should be named logically, so they can be easily memorised.

This is done well in Bologna. The bus to the airport is BLQ, the IATA code for the airport. The one to Fico food mall is F.

Not good enough, Moscow:

Excellent, Genoa:

Bus doors should always open outwards. It’s just logic: inwards-opening doors take up space that could otherwise be filled by passengers.