The chance of you going to jail is zero. I wonder about your willingness to pay - you should have stopped and put a note on the damaged car. Remember, don't drink and drive (not saying you did, but not saying you didn't either...)
Unlikely that you will go to jail; however, you handled this situation incorrectly.
Who is pursuing you for this? The owner of the park car that was damaged can pursue money damages against you for the repairs to his car that are necessary due to the collision that you caused. If the owner tendered the damage to his own insurance company, then they too can came after you for money damages through a subrogation action but only to the extent of what they paid. However, neither of the foregoing can put you in jail. Only criminal prosecution can lead to incarceration. If you are being criminally prosecuted for 'hit-and-run' then your question should be posted in the criminal law arena. If there is a the criminal action, then you would face restitution damages (money) for the cost of the repairs to the damaged car as part of a sentence. If so, then it is best to resolve that (through an attorney) with the victim as soon as possible (unless you are denying guilt where payment would be considered an admission of guilt). Again, this is the type of information you would want to discuss with a criminal defense attorney.
As for the statement above, this is an incomplete post due to the lack of details concerning your matter. It is but only an attempt to provide a cursory overview of a subject that attorneys 'practice' and improve upon during the entirety of their legal careers. This response is not meant as legal advice or as a legal opinion. Such advice would be impossible or impractical without additional information and more facts giving rise to the question. A consultation with an attorney is necessary.
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