42. The secretariat informed GRE about complaints on the intensity of (LED) stop lamps which had been reviewed by the secretariat, GRE Chair and Vice-Chair (GRE-71-02). These complaints mainly related to situations such as “stop and go” or standstill at traffic lights where the driver of the following vehicle experienced discomfort and glare due to the high intensity of stop lights. No one seemed to dispute the need for a high intensity light-signal in case of an emergency.

43. The Chair recalled that GRE, at its sixty-sixth and sixty-seventh sessions, had already discussed a proposal by GTB to allow for reducing the intensity of stop lamps when the vehicle speed was below 20 km/h. Due to lack of consensus, this proposal had been withdrawn at that time. GRE was of the view that no study proved any blinding or glare effect specific to LED stops lamps and that the reported complaints were probably related to discomfort problems in a narrow range of urban traffic conditions and that stop lamps were so far performing very well their most important safety function. Therefore, no further action was foreseen by GRE.