31. GRB followed with interest a presentation (GRB-49-10) by the expert from Japan regarding a study on approach warning systems for hybrid vehicles in motor mode. The expert from the United States of America stressed that such advanced technology vehicles would have to generate a sound informing pedestrians not only of the presence of a vehicle, but also of its speed, direction and acceleration or deceleration. Such a sound is important for the orientation especially for visually-impaired pedestrians to enable them to make an intelligent judgment about the location of a vehicle, its driving direction and its speed to avoid danger.