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From: Which sign is more visible? Measuring the visibility of traffic signs through the conspicuity index method
A
B
C
D
N
13
Mean (mm)
97,8
169,4
156,8
134,2
SD (mm)
23,6
29,9
31,7
31,4
95% conf. level (mm)
13,3
16,3
17,2
17,1
Conspicuity angle (deg.)
17,8
31,9
29,3
24,8
95% conf. level (deg.)
2,4
2,9
3,1