Tutorial author: FunGt
cargrp.dat is a file located in common\data folder and it contains the vehicles that people groups have to drive.
turismo, cavalcade, sentinel, schafter, feltzer, oracle, # POPCYCLE_GROUP_ITALIAN
In this line there are the vehicles owned by the italians. If you add another vehicle in this line, it will be owned by italians and you'll see it in the streets.