Table 6: Pearson correlation analysis of the variables.

Legibility distanceContour sizeDriving speed

Legibility distance
 Pearson correlation1.0000.9770.018
 Significance0.0000.893
Contour size
 Pearson correlation0.9771.0000.000
 Significance0.0001.000
Driving speed
 Pearson correlation0.0180.0001.000
 Significance0.8931.000