Sometimes when driving or riding a motorcycle, you can see someone about to step off the pavement in front of you. Usually, they will be wearing headphones.
Sounding your horn may cause them to stop, but it is usually too weak and diffuse a sound -especially in an urban environment.
Today’s invention is a directable loudspeaker which a driver or rider can use to actively point at a particular person or group of people. This could be targeted also at an individual car, for example.
Another variant might be to redirect some of the exhaust noise or to add a loud, recorded verbal warning so as to augment the intensified horn blast.