Which of the following is not considered a performance indicator for elevators?

The reason the color of the elevator buttons is not considered a performance indicator lies in the fact that performance indicators are metrics that evaluate the operational efficiency and effectiveness of an elevator system. These indicators typically focus on aspects that directly affect the function and user experience of the elevator.

Speed of travel is a crucial performance indicator because it determines how quickly an elevator can transport passengers between floors, impacting overall service quality. Response time is equally important, as it refers to the amount of time it takes for the elevator to respond to a call, affecting user satisfaction during peak hours. Load capacity also plays a significant role, as it indicates the weight the elevator can safely carry, which is essential for safety and the practicality of transporting various loads.

In contrast, the color of the elevator buttons does not affect the elevator's functioning or performance but instead serves an aesthetic or design purpose. While button color may contribute to the overall user experience in terms of visual appeal or branding, it does not provide measurable data about the elevator's performance. Hence, it does not qualify as an indicator of how well the elevator operates.