Altert system for wheeled vehicles

摘要

An alert system for a wheeled vehicle comprising a microphone (22) for generating an audio signal based on rolling noise produced by a wheel (21) of the vehicle, an amplifier (23) for amplifying the audio signal, and a loudspeaker (24) for producing sound in response to the amplified audio signal. Corresponding method of alerting a pedestrian (25) of an approaching wheeled vehicle.