Cloud saving now works only for the Google Play users.
You need:
The Internet connection
Cloud saving activated in the settings of the game
Google Play Games app. If you use more than one accounts on Google, check the settings of this app. Your accounts for the saving progress and the game download should be the same.
For the original game from Google Play only.
Check the "Default account" on the top and the "Account for the game" on the bottom. If necessary, change it to the one with progress.
In the future retro cars (1950-2000) from ex-USSR and Eastern Europe - Russia, Ukraine, Georgia, Armenia, Poland, Germany (GDR) and others - are going to be added. Here is the approximate list of expected vehicles, which can be changed:
Soviet:
Imported:
Won't be added:
It goes beyond the concept or needs for much time and additional technical resources.