If you’re making color-coded signs, also write the colors on the signs.
For instance, if your train has a red line, write “red line” on red line signs.
This makes the color-coded things useable by colorblind people.
Yes, this is really important. It’s not just about colorblindess, the redundancy also helps when the visual conditions are poor, such as in a case of fire or loss of power, and it can save lives in an emergency. All possible information channels should be used for aiding people to find their way.
Reblogging to add emphasis to “All possible information channels should be used”
This can be applied more generally to many more contexts than just the issues of color-related information for color blindness.
For example, if you need to warn many people very quickly that a serious natural disaster is about to occur within a few minutes, NEVER EVER confine yourself to one and only one possible channel of information. Because ANY one channel of information, in isolation, will ALWAYS miss some people. Sound-based warnings, for example, automatically miss all deaf people and some hard of hearing people and may even miss some hearing people in certain circumstances (for example, sound asleep in a room that muffles most sound from the outside). Visual warnings automatically miss all blind people. And so on. But if you use MULTIPLE channels of information in combination, then you have a much better chance of reaching very nearly everyone. For example, a siren, COMBINED WITH colored lights (carefully designed to not trigger seizures for people with photosensitive epilepsy), COMBINED WITH text messages to all cell phones COMBINED WITH radio and CAPTIONED TV messages, COMBINED WITH a buddy system for helping people who maybe can’t be reached by any of the above or still need assistance even if warned, COMBINED WITH a back up buddy or three in case the first assigned buddy/helper can’t do it.