I think the dry grip on asphalt on most tracks is set at 1.00 unless there's something special going on. What does this number of 1.00 represent in the real world? At first I thought it was an indication of the road friction coefficient, μ, but the new asphalt in the TDF is set at 1.02 and above 1.00. For example, it is often said that the pavement at the international circuit in Japan, where I live, has more grip than the pavement at other countries' circuits. On the other hand, the pavement I made for Sendai Hiland Raceway was not a special asphalt pavement for the circuit, but the asphalt pavement used for normal roads. With this in mind, I set the dry grip value of asphalt in the Sendai Hiland TDF file to 0.97. Personally, I think the grip is a little too little. If there was no particular standard, and the dry grip on most circuits was 1.00, then Especially good circuit paving > "most" circuit paving = 1.00 > "normal" asphalt paving or public roads Is this the right way to think? If you have a good TDF value for each type of road surface, please let us know.