Standard "unlock all maps" cheats do not unlock custom maps. You must install them separately.
While you cannot download "new" map expansions like DLC for other sims, you can access different simulation environments by changing your profile settings: Changing Traffic Rules (Regions): Steam achievements for regions like Germany, Canada, or Australia city car driving unlock all maps
It is a common misconception that "unlocking maps" adds entirely new countries like Germany or Canada. In City Car Driving , these names often refer to specific settings rather than physical map expansions. Furthermore, the developers have stated that custom map modding is currently not supported, meaning players are limited to the official districts provided by the developers. Standard "unlock all maps" cheats do not unlock custom maps