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  • Research, mostly involving focus groups and questionnaires, has indicated that older drivers recognize that they need more advance notice of intersections, including enhanced visibility of cross street name signs.(5) Older drivers prefer street signs with large lettering, particularly at night.(6) The average legibility index for older drivers is between 0.48 m/mm (40 ft/in) and 0.36 m/mm (30 ft/i
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