Abstract: The invention pertains to a supervision system which allows significant aid to be afforded to the operators of large road networks. Image sensors, autonomous from the electrical standpoint and comprising software for automatically detecting incidents, transmit alarms to a network management center by way of a wireless communication network. Swivelable cameras may be pointed at the alarm zones so as to perform zooms displayed on the screens of the operators of the center. The alarms are ranked by order of technical priority and then as a function of service quality criteria defined by the operator. They may be distributed into alarms requiring immediate action and other alarms. They can also be distributed into alarms for which an automatic action may be triggered and may suffice for the resolution of the incident and alarms requiring an operator action.