How did green, yellow, and red become colors meaning go, caution, and stop?
Related Questions
- Prototype drums usually came in a variety of colors - black, red, yellow, green. Is there some sort of standard as to what types of materials are stored in the different color drums?
- What do the three colors green, yellow and red indicate in VZ Navigator?
- How did green, yellow, and red become colors meaning go, caution, and stop?
