Since another question has been linked to this, which I feel isn't a totally duplicate question, and nobody has raised the issue on this question, I'd like to add some information about other consequences of speeding that a typical foreign violator might incur that haven't been raised previously.
If you are driving a rental car, the registered owner of the car is of course the rental agency. Typically the rental agency will receive the fine and will normally be required to notify the authorities who was driving. They will do so, providing the state requires it, pay the fine, add on a processing charge and then charge the driver using the credit card on file.
[Note: The info in the above paragraph is only true for parking tickets because parking tickets are issued to a car. A speeding ticket issued by an officer in person is issued to the driver. Not a car.]
Of course credit cards expire, are reported stolen, etc., but that does not normally prevent a charge being made on them. The rental agency will charge the closed/expired credit card and the credit card company will redirect this charge to another card related to it. If it is not possible to locate the card owner then it's likely that the deficiency will be raised to credit reporting agencies and the rantal company will be alerted. After attempting to contact the driver, they will probably offload this debt to a debt-collection agency.
In the end, evading fines is not something that usually does you any good. Sometimes you might get away with it, but if you aspire to have a good credit history in order to buy a house, a car, other assets are obtain credit cards in the future, this will soon come back to haunt you.
