3 ms·
What if a user is colour blind?
by paulmooreparks 5y ago
What if a user is colour blind?
- ggm 5y agoRailways worked on this. And yes, red/green is a concern. Railway signals can have 4 lights not 3, which allows for colourblind detection of bad states. In some ways, the 4th light is like a parity bit signal. (I think the 4 light signal model is possibly indicating more states as well. Train drivers are tested for colour blindness)