What is the function requirement for front windshield wipers?

The requirement for front windshield wipers is that they must function properly. This means that they should effectively clear rain, snow, or any debris from the windshield, providing adequate visibility for the driver in various weather conditions. Proper functioning wipers are essential for maintaining safety on the road, as obstructed views can lead to accidents.

While some might think that wipers only need to work in rain or specific conditions, this is not sufficient. Wipers must be responsive and able to operate at various speeds to accommodate different levels of precipitation. This adaptability ensures that the driver has clear visibility at all times, regardless of the weather. Furthermore, windshield wipers need to be reliable and should be regularly maintained or replaced when worn out, which is not addressed in the other options.