If you're making your own route, when you start Surveyor, change the region from default to something else. The default region has no cars identified in it, hence, no traffic.
If you're running existing routes, these routes have no carz in TS2009:
Banks Heath,<kuid:-18:1846763756>
British Midlands 2,<kuid:-3:10172>
Highland Valley Industries,<kuid:-3:10173>
Highland Valley,<kuid:523:1013>
Niddertalbahn,<kuid2:208598:100050:6>
Hawes Junction,<kuid:69379:100411>
Northbay County,<kuid2:44700:800045:1>
Robe River Iron,<kuid:3801:20000>
Robe River Iron,<kuid:-18:1001>
Rosworth Vale SP2,<kuid2:5562:20011:2>
Winter in the Alps,<kuid:-1:100858>
Winter in Germany,<kuid2:143919:27565:1>
Wirtschaftswunder DE,<kuid2:300062:1082:1>
Bob