Abstract
The problems of transport signs are frequently greater for older operators. Signs are more likely to be missed, not read in time, or misunderstood, and a sign's intended message may be confusing or misleading; symbols may be unclear, word messages can be ambiguous, and the print may be too small. In addition, signs are often placed in environments that make them difficult to detect. The increased likelihood of older operators' failing to heed signs may be due to a variety of factors, including failure to notice them, lack of understanding, inadequate legibility distance, or deliberate noncompliance. Research has yet to establish the full extent to which sign problems contribute to older drivers' elevated traffic accident rates.