Which equipment is NOT required for motor vehicles under Title 29-A?

The correct answer is that a window defroster is not required for motor vehicles under Title 29-A. This law establishes specific safety equipment that must be present on vehicles to ensure they are safe for operation on public roads. While brakes, headlights, and mufflers are essential components that contribute to vehicle safety and emissions compliance, a window defroster is not mandated by this specific legislation.

The focus of Title 29-A is primarily on equipment that is critical for safe driving, visibility, and noise regulation. Items like brakes ensure that vehicles can stop effectively, headlights are crucial for visibility during night driving or in poor weather conditions, and mufflers help manage exhaust noise. The absence of a defroster does not compromise the fundamental ability to operate a vehicle safely under most conditions, thus it is not classified as required equipment in this context.