how do you make roads/terrain slippery?

Im just curious on how to make things slippery like ice so i can make pile-ups.

 

I don't know if you have noticed, but if you download Frozen Lake, the Lake is completely slippery. Also, in gridmap, there is a terrain testing area of ice. If you borrow a terrain texture (With permission) and paint it under a decal road, you will get a slippery road.

 

You can paint a material that you want to be ice and make the texture whatever you want as long as the name is still "Ice".

 

The name can be whatever, it is the internal name that matters.

 

Sorry, meant internal material name not editor material name!

 

I got what you meant, I just wanted the other user to.