Particles

Hi I am trying to use decal roads but the particles are grass instead of tire marks and tire smoke. How do you change the particles of decal roads?
thanks

 

You have to change the terrain under the road to asphalt. Putting a road decal over grass means it will behave like grass.

 

Do you mean change the texture of the terrain under the road?

 

With the terrain painter. The thing that allows you to change the material of the terrain from grass to sand or asphalt.