THE HAGUE - Occasionally, narrow white ribbed lines with relief tiles and tiles with small hemispheres (studs) can be seen in the streetscape. These are tactile guidance lines that serve as a very useful mobility aid for the blind and visually impaired. With these, a person with a visual impairment, with or without a white cane, receives a message: the direction of travel, a warning, or an important landmark. ROBIN UTRECHT /ANP netherlands out - belgium out

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