What must a motorcycle operator always wear while riding?

Wearing a DOT-approved helmet is essential for motorcycle operators because it significantly reduces the risk of severe head injuries in the event of an accident. Helmets that meet Department of Transportation (DOT) standards have been tested for impact protection and are designed to absorb energy from impacts, thereby providing critical protection for the rider's head and brain.

While other options, such as reflective vests or a motorcycle jacket, can enhance visibility and protection, and wearing goggles or sunglasses can help shield the eyes from debris and weather elements, these are not legally mandated in the same way that helmets are. Therefore, the consistent requirement for helmet use underscores its vital role in rider safety, making it the correct choice in this context.