Wherever you are, you need to do what they do since that is the custom in that place. When you are in Rome, you do what the Romans do, but when you are in highly traffic area, you need to obey the traffic police or you will be sorry.
The game is played via mouse and the idea here is to let through the vehicles that need to get through to be able to advance to the next level. You will earn money that way and you can use the money to buy some traffic signs. You failed once an accident occur.