SSE Help request - removing lighting effects from road/ground meshes

[Justletmepickaname]

Hello- I've recently embarked on a venture to create gravel/dirt roads.

Texture creation has gone well, but I have reached an unexpected hiccup -

 

I've noticed that different road and ground meshes cause the textures to show in a different shade (presumeably from different shader flags/lighting effects)

 

I was curious if anyone could turn me in the right direction as to what values to change in the meshes.

 

The grey gravel I've chosen shows great on most road meshes, but shows up as brown/gold hued on road chunks, bridges, and certain curved road meshes.

 

Any input is greatly appreciated.