hi , i think tarmac is need it for make layouts , the concrete is slipy and less grip btw no tires marks in it : s just take this suggestion for next patch c:
Tire skidmarks are done a special way in LFS in that the surface is made slightly more and more transparent each time a tire "lays down the rubber". The transparent part shows the dark area below the track which makes the skidmark effect.
Unfortunately objects in layout editor don't have the option to be able to be made transparent in the same manner so it might not be an easy thing to do.