[2020] No Traffic at all

Did you save the game after you started the mod? And are now trying to launch that save without the mod? That is usually what causes the issue with Real Time mod. I do believe that the mod itself does offer a ghost mode which would allow you to run the save again but without the mod being fully active

It simply disabled the functions of the mod while allowing for the bare minimum of it to run, and allows you to open the save game and continue playing it