I think it is bugged, instead of giving you the amount mentioned in its description it gives you the experiance multiplied by the number of roads so every time i upgrade my roads i jump 10 levels higher and i have only 60 roads build
I think this might be something missed by developer since roads are the only thing that consists of many parts which are upgraded all at once
I think this might be something missed by developer since roads are the only thing that consists of many parts which are upgraded all at once