A likely problem at traffic signals, the defect called deuteranopia usually causes confusion of red & this color
Missing green cone gene, Deuteranopia - Green blind (also called red-green 
..... cases exist where color identification might cause confusion, because traffic... [DOC] [TLE] Colour vision deficiency (colour blindness) - NHS Choices [PAR] This is known as "red-green" colour vision deficiency.