What is required by law for all drivers in Massachusetts?

In Massachusetts, all drivers are legally required to carry proper vehicle registration while operating a motor vehicle. This ensures that the vehicle is registered with the state, which contributes to road safety and accountability. Vehicle registration provides essential information about the vehicle's ownership, insurance, and compliance with state laws. Failing to have proper registration can lead to penalties, including fines and possible legal issues.

The other options do not represent legal requirements for drivers in Massachusetts. For example, having a passenger at all times is not mandated by law; drivers can operate their vehicles solo. Wearing sunglasses, while potentially helpful for visibility in bright conditions, is not a legal requirement. Similarly, using a navigation system can be a personal choice for convenience but is not legally mandated for driving. Thus, carrying proper vehicle registration stands out as the law that must be adhered to by all drivers in the state.