It would be great to have more various weathers on every tracks, such as sun, fog, rain, snow, etc. It would also be great if there was a larger choice of daytime, like midnight, etc. And finally, there could be on cars things like window wipers, and various lights, such as marker lights, passing lights and reflectors. And finally, a very-very good thing would be if the lights could be seen when reflecting on walls .

P.S.: Sorry if you don't understand some words, i'm from Hungary, and therre are words that I may ignore

Indeed, it would be good. But all these ideas were already suggested. See this thread before posting next time