Please note, that this is not a homework site. We won't do your homework for you. However we are always willing to help solve problems you encountered, correct mistakes you made in your code and answer your questions.
We didn't see your attemts to solve this problem youself and so we cannot correct mistakes you didn't made and answer questions you didn't ask. To get help you should do something yourself and get real problems with something. If your problem is "I don't understand a thing", then you should go back to basics and study again.
Think about how you store data about one vehicle. (Hint: struct)
Think about how you store vehicles. (Hint: vector)
"Increasing scale" sounds like sort, std::sort.
If you had a struct, how would you print it?