Systems and methods are disclosed preventing accidents by altering user interfaces of self-driving vehicles based on movements of passengers in the self-driving vehicles. The system and methods generate for display media content on a user interface for a self-driving vehicle and determine whether a value of movement from a wearable user device of a user within the self-driving vehicle exceeds a threshold value (indicating the maximum value at which the self-driving vehicle removes the media content on the user interface). Responsive to a determination that the value of the movement from the wearable user device exceeds the threshold value, the system and methods remove the media content on the user interface for the self-driving vehicle.