The Driver Syndicate/Vehicles/Vehicle Zones
Adding to a vehicle zone
Vehicle zones are .def files found within scripts/levels pathing.
for default city its GameData/scripts/levels/default_vehiclezones.def
for your city it'll be Addons/YourCity/scripts/levels/mycity_vehiclezones.def
To add to them you simply add the name of the car you want, and the name has to match their script name. So if you wanna add arvensis.txt you will add arvensis <number>;
The number determines the rarity of traffic in a level.
0 - the car will appear in traffic very often 100 - the car will be very rare.
To add a vehicle zone to your city you will add your cities name to the beginning of the script file. For example default_vehiclezones.def is for default city, while victoria_vehiclezones.def is for Victoria.