Try downloading this region and place it in the config file of your Route:
kuid 524343:6667 "World Traffic Region Mix std"
This region was uploaded by user arraial. It features a lot of more realistic looking traffic. Of course, you can add your own favorites or subtract those you don't like.... or even create your own region. Just make sure the vehicle has the line:
trackside 0.01
in the config file.
Cheers,
Dave Snow