Disney rides stop for a variety of high-value safety and operational reasons, most commonly due to "sensors" and "cycling." Modern rides use hundreds of sensors to track vehicle positions; if a sensor detects something out of place (like a dropped hat on a trackless ride) or if a vehicle takes too long to load, the computer triggers an automatic "E-stop" (Emergency Stop). Another common reason is "cascading," where a delay at the boarding station causes vehicles further along the track to stop to maintain a safe distance. Additionally, rides are often slowed or stopped to assist guests with mobility issues during the boarding process. While frustrating for guests, these stops are a premier indicator that the ride's safety systems are working exactly as designed.