Yes, 90kmh is understandable, what is not really clear is that before highway crossing you get 70kmh sign, after it there is no sign. I take it as then you can go 90kmh unless speed limit sign  works even after the highway crossing. 
The other example I an in trouble is again, highway crossing, before the crossing is 70kmh sign (not a problem) but after the crossing is also a 70khm sign, everyone drives 70khm and then from all of a sudden, everyone accelerates to 90kmh yet there was no sign of any kind that would allow such speed. Any caveats I am missing here?

I guess you have reverted the changes?