Possible to display a warning sign on routes that are just roads with high speed?

[tsobuskerudbyen]

Is it possible to extract maxspeed and other tags after finding a route? So that for example a route with no sidewalks and maxspeed over 60 km/h would display the speed sign for that route?
Example:
This road: https://www.openstreetmap.org/way/940929354
In the pilot: https://leonard.io/cycling-norway/?from=59.62735%2C10.40637&to=59.64061%2C10.39452#13.37/59.63397/10.40041
...Would look something like this:

In Norway we have then here the possibility to have 70, 80, 90, 100 and 110 km/h, as described here: https://no.wikipedia.org/wiki/Fartsgrenser_i_Norge. Guess 100 and 110 is out of the question, as those roads are tagged as highway=motorway.