Under what condition can a driver be fined for violating the safety belt law?

The correct answer is that a driver can be fined for violating the safety belt law when they are stopped for a traffic violation. The safety belt law in Massachusetts mandates that all occupants of a motor vehicle must wear seat belts, and law enforcement officers are authorized to pull over vehicles and issue citations specifically for seat belt violations during any traffic stop. This emphasizes the importance of wearing seat belts at all times, as compliance is actively monitored by authorities to enhance road safety.

In contrast, being parked on the street does not involve driving, so the safety belt law would not apply, and no fines could be issued for that scenario. Additionally, only being involved in an accident does not lead to a fine for failing to wear a seatbelt unless the driver was also stopped for a traffic violation. Routine safety checks generally do not pertain to issuing tickets for seat belt violations unless they are part of a broader traffic enforcement initiative.