Answer:
If the police are unable to locate the other driver (and you were not injured in the crash), your next step would be to file an uninsured-motorist claim for property damage with your own insurance company.
If you were hurt in the accident, be sure to consult with a personal injury attorney about your potential injury claim as these are handled very differently from property damage claims. In addition to an uninsured motorist claim, you will likely wish to file a personal injury protection (PIP) insurance claim as well. A PIP claim will give you near-immediate access to needed cash, and are considered “no-fault” claims. This means that your insurance rates should not increase due to a PIP claim. Follow this link for more information on personal injury protection claims.