Table S1.

Driver demography

DemographicYellow, %Blue, %
Age, y
 <3644
 36–4065
 41–45109
 46–501618
 51–552123
 56–602123
 >602217
Education
 Primary1514
 Secondary7780
 Tertiary96
Experience, y
 <35456
 3–61413
 7–101211
 11–151110
 16–2066
 21–2522
 26–3001
  • The difference in age is insignificant at χ2 = 12.52 < χ (0.01,6) = 16.81. The difference in education is insignificant at χ2 = 7.48 < χ (0.01,2) = 9.21. The difference in experience is insignificant at χ2 = 4.82 < χ (0.01,6) = 16.81.