Solved

5 red stars

Hello again, what does mean 5 red stars by my driver, also in the las training, my driver go only 5 points, in every push, why it's so low improvement? thanks

Hi your driver has his maximum rating 9 level as your team so his training progress lowers and for now any attribute over 9 won;t increase but maybe soon;)
https://igpmanager.com/?url=forum-thread/5613

Thank you Sam for the info. I'm also curious as to what the half-stars mean? I've seen people with 5 gold stars, level 4. Also, I have a driver with 5 and a half stars, but level 5. Is that the potential ceiling?

The Stars represent the driver's lvl regarding to yours. So me best guess would also be, that your driver showing 5.5 stars as lvl 5 regarding to your lvl 5, means that is somewhat close to lvl 6.

But we will propably see this only in our lvl range I guess.