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Equipping pedestrian street crossings with acoustic and tactile signals to help disabled persons was a step forward. The problem is that they vary from one country to another. Now, a new ISO standard provides the basis for harmonizing such signals on a worldwide basis.
The aim of ISO 23600:2007, Assistive products for persons with vision impairments and persons with vision and hearing impairments – Acoustic and tactile signals for pedestrian traffic lights is to ensure equivalent information worldwide at intersections equipped with pedestrian crossing signals.