PAY SPECIAL ATTENTION TO : 

This mod doesn't work with other addons (cars, maps, mods). You can try to play with your addons but don't forget to lower the traffic inflow from the city selection. I tested only with the recent addons, the latest released vehicles (more than 30.000 polys), the latest mods (Shadermod 2, new Police cars, improvements patches) and the latest detailed tracks. I replaced all the traffic cars of MM2 (excepted the London bus) but unfortunately the game can't handle more polygons.

Further infos available from the readme.txt