Solved Slippery Textures even with asphalt layer

I want to have grass that an be driven on, and I cannot do this because the cars slide all over. Whenever I have a decal road, I put an asphalt layer underneath, and it fixes that, but I cannot do this. Is there some way to make an asphalt layer look like grass. On the gridmap and smallgrid, the asphalt is a grid looking texture, and on Derby, the asphalt is like dirt, and acts like dirt.

So, how can I change the presets on the asphalt layer to make it like grass? It seems like something that could be done with the file in the folder, so can I open the asphalt file in paint.net, and replace the current asphalt layer with the grass file? Or will this create a duplicate of grass with another name?

I am coming out with a few new maps, and they are already planned out. It's just time to start thinking about making them. I need some different road types and stuff, so having different asphalt textures would be nice.

Thank you to whomever can help my problem!!!
-AIM

 

Thanks so much @Nadeox1!!! It was so helpful!! I am going to see if it works!!