Dear Robin, dear Nils,
I think you are talking about two slightly different things. What Robin needs is the option to increase the average speed, possibly even over the legal limit. What @nils is referring to, however, is the maximum speed limit which sets a certain threshold while still obeying any legal limits or restrictions based on road classification. Unfortunately, we currently don’t offer a solution to the former. The latter feature is indeed in our development pipeline and will be released soon. It will allow you to select a certain maximum speed, say 80km/h on roads which normally have a higher speed assignment based on legal situation and road properties. For more details see #480.
@Robin, in order to address your use case you would probably need to implement a dedicated emergency profile based on the VehicleFlagEncoder, you might use HGV as a template.
Cheers,
Andrzej