| 摘要 |
<p>A device (10) for warning blind or visually impaired travellers (19, 20) that they have entered a potentially dangerous area proximal to the edge (14) of boarding platforms (12) of the type typically found in public railway transit systems includes an array of infrared transmitters (24) and a portable detector/warning device (30) to be held by the blind or visually impaired traveller (19, 20). The transmitters (24) create a beam (28) of infrared light which bathes the section of the platform (12) proximal to the platform edge (14). As the traveller (19, 20) moves into the region of the platform covered by the emission, the sensors in the warning device (30) are activated and by audio, tactile or other stimuli alert the traveller (19, 20) of entry into a danger zone.</p> |
