This paper presents the development and evaluation of a vibrotactile system designed to improve the safety of hearing-impaired people in urban environments. The system converts critical sounds, such as alarms, vehicle horns and shouts, into specific vibration patterns perceived through the skin. For the evaluation, 10 volunteers were tested and fitted with headphones emitting white noise, preventing them from perceiving external sounds. During the experiment, participants were asked to identify, through wrist vibrations, simulated sounds corresponding to alarms, horns and screams. The system used three vibration patterns: one pulse for a scream, two pulses for a horn and three pulses for an alarm. Results showed that 90% of participants correctly identified the vibratory stimuli, with the alarm being the easiest stimulus to perceive, with an average of 2.9 pulses perceived. The clarity of the vibrations remained high, with an average of 3.2 out of 4 for the alarm, and the comfort of the device was rated as moderately acceptable, with a slight preference towards the more intense stimuli. The vibrotactile system proved to be an effective tool for transmitting critical warning signals, providing hearing impaired people with clear sensory feedback, improving safety and autonomy in urban environments
