Thank you superku for your answer !

I tried setting them to unlit. But this means, that my cars, when driving over a roofed bridge (wmp) the cars don't get darker as they should.
I also use cars with multiple textures and LOD, at least for one car now. Means lots material skin setting experimentation. Anyway, it could be a way.

Its so strange, that my car takes the level wmp blocks lighting values when entering or being over it, but does not change them when leaving. Maybe the engine expects another block entity to take some new (or old) values from. In my level the will only find terrain. Anyway I will start to find a bypass/praxis oriented solution.

THX again.

Neodumont