Method for monitoring the travel operation of a passenger conveyor system (51, 61, 71, 81) configured as an escalator or moving walkway by means of a monitoring system, the monitoring system comprising a hazard analysis module, an interaction module, a control module and at least one motion-sensing module (41,..., 46+2n), which is directed toward an associated passenger conveyor system (51, 61, 71, 81) and can capture electronically processable motion sequence images (441,..., 446+2n) of situations that occur on the associated passenger conveyor system (51, 61, 71, 81), characterized • in that the at least one motion-sensing module (41,..., 46+2n) transmits the motion sequence images (441,..., 446+2n) thereof in real time to the interaction module and to the hazard analysis module; • in that the motion sequence images (441,..., 446+2n) are displayed on a screen (22, 91,..., 96+2n) of the interaction module; • in that at the same time, in the hazard analysis module the motion sequence images (441,..., 446+2n) are examined for critical situations (101,..., 101C) for users (102,..., 120C) of the passenger conveyor system (51, 61, 71, 81) by means of analysis algorithms and, as soon as a critical situation (101,..., 101C) is detected, a warning signal (13,..., 13C) is sent to the interaction module; • and in that on the basis of the warning signal (13,..., 13C), the interaction module visually and/or acoustically emphasizes the motion sequence image (441,..., 446+2n) displayed on the screen (22, 91,..., 96+2n) and generates a confirmation input field on the screen (22, 91,..., 96+2n); a manual tap on the confirmation input field causing the interaction module to send the warning signal (13,..., 13C) to the control module, and the control module influencing the travel operation of the passenger conveyor system (51, 61, 71, 81) on the basis of the transmitted warning signal (13,..., 13C). the monitoring system comprising a hazard analysis module, an interaction module, a control module and at least one motion-sensing module (41,..., 46+2n), which is directed toward an associated passenger conveyor system (51, 61, 71, 81) and can capture electronically processable motion sequence images (441,..., 446+2n) of situations that occur on the associated passenger conveyor system (51, 61, 71, 81), characterized • in that the at least one motion-sensing module (41,..., 46+2n) transmits the motion sequence images (441,..., 446+2n) thereof in real time to the interaction module and to the hazard analysis module; • in that the motion sequence images (441,..., 446+2n) are displayed on a screen (22, 91,..., 96+2n) of the interaction module; • in that at the same time, in the hazard analysis module the motion sequence images (441,..., 446+2n) are examined for critical situations (101,..., 101C) for users (102,..., 120C) of the passenger conveyor system (51, 61, 71, 81) by means of analysis algorithms and, as soon as a critical situation (101,..., 101C) is detected, a warning signal (13,..., 13C) is sent to the interaction module; • and in that on the basis of the warning signal (13,..., 13C), the interaction module visually and/or acoustically emphasizes the motion sequence image (441,..., 446+2n) displayed on the screen (22, 91,..., 96+2n) and generates a confirmation input field on the screen (22, 91,..., 96+2n); • in that the at least one motion-sensing module (41,..., 46+2n) transmits the motion sequence images (441,..., 446+2n) thereof in real time to the interaction module and to the hazard analysis module; • in that the motion sequence images (441,..., 446+2n) are displayed on a screen (22, 91,..., 96+2n) of the interaction module; • in that at the same time, in the hazard analysis module the motion sequence images (441,..., 446+2n) are examined for critical situations (101,..., 101C) for users (102,..., 120C) of the passenger conveyor system (51, 61, 71, 81) by means of analysis algorithms and, as soon as a critical situation (101,..., 101C) is detected, a warning signal (13,..., 13C) is sent to the interaction module; • and in that on the basis of the warning signal (13,..., 13C), the interaction module visually and/or acoustically emphasizes the motion sequence image (441,..., 446+2n) displayed on the screen (22, 91,..., 96+2n) and generates a confirmation input field on the screen (22, 91,..., 96+2n); a manual tap on the confirmation input field causing the interaction module to send the warning signal (13,..., 13C) to the control module, and the control module influencing the travel operation of the passenger conveyor system (51, 61, 71, 81) on the basis of the transmitted warning signal (13,..., 13C).