If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
This is a job for the New York Police Department and for the best officers. Are you ready for some hard core car chase in the crowded streets, in the middle of the rush hour?
Catch the bad guys, put them behind bars.
Try to avoid bumping into cars and the side of the street, if you can't avoid collision look for the health bonuses to get back your strength.
Also if you are fast enough, you will be able to collect the Turbo and Shield bonuses, they will give you extra boost and protection.