How should wipers be checked for operation?

The operation of windshield wipers should primarily be checked by verifying that they function at the speed specified by the manufacturer. This means that the wipers should move at the correct rate as outlined in the vehicle's specifications, ensuring they are efficient in clearing rain, snow, or debris from the windshield. This check is essential for maintaining visibility and safety while driving.

While other aspects of wiper functionality, such as delay mechanisms and blade condition, are also important, they are not the primary consideration when testing for operation in terms of speed. Ensuring that the wipers operate at the correct speed indicates they are functioning properly and are capable of providing adequate visibility under various weather conditions. This makes the specification of speed the most critical factor in assessing overall wiper operation.