Skybox exposure and easyroad texture problem

hello, you will see I am trying to create a day night cycle which I have achieved, although it is still somewhat crappy but well, the fact is that I have made that when the light is at 180 degrees in x the exposure of the skybox becomes 0, but The problem is that when I change the exposure it affects the texture of my easy road asset to the point that the texture turns black and looks ugly and weird.
How can I make the exposure not affect the easy road?...

Skybox exposure and easyroad texture problem