What is a minimum requirement for a vehicle's windshield wiper?

A vehicle's windshield wiper must work well and be automatic to ensure optimal visibility for the driver under various weather conditions. An effective windshield wiper system is crucial for safety, as it helps remove rain, snow, and debris from the windshield, allowing the driver to maintain a clear view of the roadway. Modern vehicles typically come equipped with automatic wipers that adjust their speed based on the intensity of precipitation, enhancing convenience and safety.

The other options do not meet the effectiveness or safety standards expected for windshield wipers. For instance, a manually operated wiper may not provide the same ease of use, particularly in sudden downpours. A dual system may be beneficial, but it is not a minimum requirement as long as the wipers function properly. Lastly, wipers need to be positioned effectively on the vehicle, typically centered at the base of the windshield, rather than specifically on the passenger side.