Try to reach the next checkpoint within the given time limit. Be careful as other cars will block you. Sometimes they will even block all 3 lanes so you will have to use a special feature of your taxi! Just jump over other cars and continue your high speed frenzy. Once you pass a checkpoint you will get additional time. As you progress the time for passing a waypoint will steadily decrease. Later in the game you will be able to pick up clocks which will add 5 seconds to your time. There are also turbo items on the track. Collect 3 of them to activate the turbo. Unlock secret cars if you are able to beat very high scores. While other taxi drivers may get bored you will certainly like your duty!