and bus operators put a lot of effort into fleet economies of scale, so having to hive their fleets in two with slower and faster buses is unlikely to go well. Especially since there are perfectly valid reasons for an out-of-service bus to use a faster road; 30kph as a maximum is slow enough that the vehicle would be banned from certain classes of road altogether.
> having to hive their fleets in two with slower and faster buses is unlikely to go well
They already do this though. I don't know about Amsterdam, but in Limburg the buses are electric for in-city routes and gas for the longer routes between cities and countries.
even in Amsterdam, where most speed limits have reduced to 30kph, there are still main roads and public transport lanes signed for 50kph. https://etsc.eu/amsterdam-follows-paris-brussels-and-madrid-...
and bus operators put a lot of effort into fleet economies of scale, so having to hive their fleets in two with slower and faster buses is unlikely to go well. Especially since there are perfectly valid reasons for an out-of-service bus to use a faster road; 30kph as a maximum is slow enough that the vehicle would be banned from certain classes of road altogether.