@dan-c
You can report map inaccuracies directly on the website or via the app, and the mapy.com editors will fix them.
Another option is the OpenStreetMap project.
Mapy.com uses data from the OpenStreetMap project, which is an open-source service updated by volunteers. However, mapping roads and other features in OSM has its own specific guidelines, so it is advisable to check the basic rules, here:
https://wiki.openstreetmap.org/wiki/Editing_Standards_and_Conventions
https://wiki.openstreetmap.org/wiki/Good_practice
https://wiki.openstreetmap.org/wiki/Beginners%27_guide
Or you can contact the OSM community in Romania, here:
https://wiki.openstreetmap.org/wiki/WikiProject_Romania