If you hit an unattended vehicle, it's required to leave a note with your contact information, such as name, address, and a brief explanation of the incident, secured in a visible location on the vehicle. This ensures transparency and accountability, allowing the vehicle's owner to contact you for subsequent repairs or insurance claims. Failing to do so may lead to hit and run allegations and legal consequences. Such actions uphold responsibility and fairness in resolving incidents without the immediate presence of the other party.