A taxi driver earns through his taxi and he won't earn if he can't deliver the passenger on time to their destination. He needs to drive fast to do that, but he also needs to make sure that his taxi won't be damage as he needs to pay for the damage.
In this game, you will be going to the passenger and then you will deliver them to their destination as fast as you can. The game has a time limit, so keep in mind that you need to drive your taxi as fast as you can without endangering the passenger. Only after you send the passenger to their destination that you can proceed to the next level.