Another ear / risk detector with watch

The hearing-impaired are severely exposed to the danger in our traffic system.
In this system, the driver in vehicle can only warn pedestrian by blowing their horn.
This (watch) can prevent the dangerous situation caused by their hearing problem from converting specific warnig sound to vibrations signals.
It will gently vibrate to give them a warning and indicate the direction of the risk on their wrist. So this machine should help to keep them alert and able to quickly avoid danger.
Also the design is inspired by human ear shape. May this small device be second best ear.