Which of the following is NOT a function performed by a laptop computer in relation to traffic signal controllers?

The laptop computer plays a critical role in the setup and maintenance of traffic signal controllers, but it does not control the traffic lights directly. Instead, it serves as a tool for communication and configuration.

When traffic signal technicians use a laptop, they can perform functions such as uploading signal system software, downloading operational parameters, and setting up equipment necessary for the operational readiness of traffic signal systems. These tasks involve configuring the traffic signal controllers, adjusting settings based on traffic patterns, and ensuring that the hardware operates correctly.

However, the actual control of traffic lights is the responsibility of the traffic signal controller itself. The controller contains the necessary hardware and software to manage the operation of traffic lights based on pre-defined logic and real-time traffic data. The laptop assists in facilitating communication and configuration but does not manage the traffic signals during operation. Therefore, stating that controlling the traffic lights is a function of the laptop is not accurate.