Drive a fire trucks, cranes, freight trucks, and many more around the city completing missions. Each missions are timed, so you will need to be quick.
Drive carefully and try not to crash into people, because you will receive a time penalty. You’ll earn money from each successfully completed mission, spend it to buy better trucks. Each vehicle is upgradeable; you can upgrade its speed, brakes, and steering.
As Always, Good Luck and Have Fun.