Final answer:
The penalties for not reporting a vehicle crash vary depending on local laws and details of the incident; the provided study does not supply enough information to determine specific jail time.
Step-by-step explanation:
The penalties for failing to report a significant vehicle crash vary by jurisdiction and the specifics of the incident. However, based on the information provided which seems to be part of a study and not actual legal guidelines, it's not possible to accurately determine the jail time for not reporting a vehicle crash. The legal consequences for such an action typically depend on the severity of the accident, injuries involved, and local laws. Jail time could range from no jail time at all to significant sentences for hit-and-run incidents. You should consult local traffic laws or a legal expert to get information relevant to your specific region or circumstance.