Avoid consulting maps in public because it draws attention to the fact that you're unfamiliar with the area. If you see another motorist apparently stalled along the road, do not stop. As you drive by, tell the motorist you will call the police for help. The maps you receive from either the Chamber of Commerce or Travelers Aid can help you track the course to your destination. When entering a cab, check for the cab identification number.
Most cities require cabs to have licenses.
Ask the driver in advance how much it will cost to get to your destination. Stay with other people. Stand away from the curb. If possible, sit close to the driver in an aisle seat. Notify the driver immediately if anyone bothers you or even acts suspiciously.