Electronic device for generating an alert signal, the device being able to be carried on board a vehicle, in particular an autonomous vehicle, the vehicle defining an interior space designed to receive a set of passengers, the device comprising: - an identification module designed to identify at least two items of information from two different categories from at least one image from at least one image sensor on board the vehicle, each category being chosen from the group consisting of: the presence of an animal or an object that is prohibited and/or abandoned by one of the passengers; a characteristic movement or posture of one of the passengers; and the presence of a furnishing element of the vehicle; - a detection module designed to detect an incident from the combination of said at least two items of information from two different categories and from a warning rule associating said at least two items of information with said incident; and - a generation module designed to generate at least one warning signal upon detection of an incident by the detection module; et, - a processing module designed to receive the warning signal and to send, depending on the warning signal, a request for assistance to an external platform monitoring the vehicle or a command chosen from the group consisting of: a sound command to a speaker located in the interior space or on an external wall of the vehicle; a visual command on a display screen located in the interior space or on an external vehicle wall; an emergency stop command to an on-board braking system; a door locking command of the vehicle; a command for moving the vehicle; a vehicle speed variation command and a command to send an alert signal to an organization in charge of maintaining order, the processing module being designed to send the command or the request for assistance as a function of a level of probability of detection of the incident calculated by the generation module of the device, the processing module being designed to send the request for assistance to the external monitoring platform when the level of probability of detection of the incident is less than a predefined threshold, in order to allow the operator to confirm the reality of the incident before making a decision. - an identification module designed to identify at least two items of information from two different categories from at least one image from at least one image sensor on board the vehicle, each category being chosen from the group consisting of: the presence of an animal or an object that is prohibited and/or abandoned by one of the passengers; a characteristic movement or posture of one of the passengers; and the presence of a furnishing element of the vehicle; - a detection module designed to detect an incident from the combination of said at least two items of information from two different categories and from a warning rule associating said at least two items of information with said incident; and - a generation module designed to generate at least one warning signal upon detection of an incident by the detection module; et, - a processing module designed to receive the warning signal and to send, depending on the warning signal, a request for assistance to an external platform monitoring the vehicle or a command chosen from the group consisting of: a sound command to a speaker located in the interior space or on an external wall of the vehicle; a visual command on a display screen located in the interior space or on an external vehicle wall; an emergency stop command to an on-board braking system; a door locking command of the vehicle; a command for moving the vehicle; a vehicle speed variation command and a command to send an alert signal to an organization in charge of maintaining order, the processing module being designed to send the command or the request for assistance as a function of a level of probability of detection of the incident calculated by the generation module of the device, the processing module being designed to send the request for assistance to the external monitoring platform when the level of probability of detection of the incident is less than a predefined threshold, in order to allow the operator to confirm the reality of the incident before making a decision.