Maintenance of the vigilance of drivers is important for road safety. We consider the means that have been developed for detecting a decrease in this vigilance as well as the two important categories of indicators of the state of the driver:
We review the different items of equipment that can be fitted to the drivers or their vehicles and then refer to the results of experimental work on the driver’s posture and in particular the position of his head. Finally we refer to the importance of providing an appropriate alarm and the need for psycho-ergonomic work aimed at facilitating the acceptance and use of these driver aids.