Which of the following is a key requirement when operating a moped?

Wearing a helmet is a key requirement when operating a moped because it significantly enhances the safety of the rider. In many jurisdictions, including Massachusetts, helmet use is mandated by law for moped operators and passengers due to the increased risks associated with riding a two-wheeled vehicle. Helmets are designed to protect the head in the event of an accident, reducing the risk of severe injuries or fatalities.

The other options do not align with safe driving practices or legal requirements. Using a cell phone while driving can distract the rider and increase the likelihood of an accident. Ignoring traffic laws can lead to dangerous situations on the road and legal consequences. Additionally, driving without a license is illegal and demonstrates a disregard for the rules and regulations that ensure safe vehicle operation. Therefore, wearing a helmet stands out as a crucial safety measure while riding a moped.