Method for controlling a flow of individuals entering and exiting an enclosure through an opening, said method comprising the following steps carried out by an electronic signalling system: - controlling the implementation of a first signalling mode on a set of signalling devices arranged at least at the opening; - triggering the switchover from the first signalling mode to a second signalling mode on the set of signalling devices, the second mode being different from the first mode; said method comprising a step, carried out by the electronic signalling system, involving: - measuring the flow of individuals exiting the enclosure through the opening; - during the step of triggering the switchover from the first signalling mode to the second signalling mode, the switchover from the first signalling mode to the second signalling mode is triggered according to at least the measurements carried out of the flow of individuals exiting; according to which the first signalling mode signals that entry is not permitted and exit is permitted, while the second signalling mode signals at least that entry is permitted; and according to which the set of signalling devices comprises at least one first subset of signalling devices (4.1) arranged such that the signalling of said first subset is delivered faced with the flow of individuals exiting and a second subset of signalling devices (4.2) different from the first subset of signalling devices (4.1), the second subset of signalling devices (4.2) being arranged such that the signalling of said second subset is delivered faced with the flow of individuals entering, and according to which, for at least one of the first and second signalling modes, the implementation of said mode comprises implementing signalling of a first type on the first subset and implementing signalling of a second type, different from the first type, on the second subset. - controlling the implementation of a first signalling mode on a set of signalling devices arranged at least at the opening; - triggering the switchover from the first signalling mode to a second signalling mode on the set of signalling devices, the second mode being different from the first mode; said method comprising a step, carried out by the electronic signalling system, involving: - measuring the flow of individuals exiting the enclosure through the opening; - during the step of triggering the switchover from the first signalling mode to the second signalling mode, the switchover from the first signalling mode to the second signalling mode is triggered according to at least the measurements carried out of the flow of individuals exiting; according to which the first signalling mode signals that entry is not permitted and exit is permitted, while the second signalling mode signals at least that entry is permitted; and according to which the set of signalling devices comprises at least one first subset of signalling devices (4.1) arranged such that the signalling of said first subset is delivered faced with the flow of individuals exiting and a second subset of signalling devices (4.2) different from the first subset of signalling devices (4.1), the second subset of signalling devices (4.2) being arranged such that the signalling of said second subset is delivered faced with the flow of individuals entering, and according to which, for at least one of the first and second signalling modes, the implementation of said mode comprises implementing signalling of a first type on the first subset and implementing signalling of a second type, different from the first type, on the second subset. the first signalling mode signals that entry is not permitted and exit is permitted, while the second signalling mode signals at least that entry is permitted; and according to which the set of signalling devices comprises at least one first subset of signalling devices (4.1) arranged such that the signalling of said first subset is delivered faced with the flow of individuals exiting and a second subset of signalling devices (4.2) different from the first subset of signalling devices (4.1), the second subset of signalling devices (4.2) being arranged such that the signalling of said second subset is delivered faced with the flow of individuals entering, and according to which, for at least one of the first and second signalling modes, the implementation of said mode comprises implementing signalling of a first type on the first subset and implementing signalling of a second type, different from the first type, on the second subset.