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Using a group of old and young drivers, six symbol signs were investigated in both laboratory and field settings. With six trials per sign, legibility distances, defined as the distance at which the sign is correctly identified from a menu, were collected. Two major findings emerged: first is the successful development of a new laboratory simulation technique for the investigation of legibility distances. Correlations coefficients between laboratory and field legibility distances were computed and appear very promising. Large within subject variability was discovered in both age groups' data of legibility distances, both in the laboratory and field trials. This variability led to alternative ways of defining the dependent variable equivalent to designs of past studies examining legibility distances of the same signs.