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From: Which sign is more visible? Measuring the visibility of traffic signs through the conspicuity index method
Panel in Fig. 4
Panel in Fig. 5
Forest background in Fig. 3
Wall background in Fig. 3
N
57
59
54
Mean (mm)
100
37
>135
77
SD (mm)
20
17
–
25
95% Conf. level (mm)
5
4
7
Conspicuity angle (deg.)
17.3
6.5
>42
13.6
95% Conf. Level (deg.)
0.9
0.8
1.2