It depends on the jurisdiction. Sometimes, these well-intended people get issued a citation or even arrested. Why?
- The meter is intended to limit how long someone can park in that space, so feeding someone else’s meter thwarts public policy.
- Parking tickets are much more costly than a few quarters in a meter, thus boosting municipal revenues.
- There’s a contract of sorts between the jurisdiction and the person who parked; the municipality offers a parking space for a stated fee, and the driver pays the fee to use the space. A third party who feeds the meter is interfering with the contract, unilaterally changing its terms and possibly creating a third-party liability.