The best way to visually display simple messages, is simply
In Sunday’s Washington Post is an article on how Metro is trying to get its train drivers to stop at red lights. Through inattention, rote and sometimes tiredness, Metro drivers sometimes drive through red alerts. The mistake can be disastrous.
- All caps. Why? Because you’re emphasizing what’s most important? And every letter in this message capitalized?
- Yellow. A yellow background is really good with a contrasting color. Like green or black. And vice versa. In this case, the second thing your eye sees is the background.
- Red. In small doses, red can make your heart lightly race. A little goes a long way.
- Bold. Bolding one or two words in a sentence draws the reader’s eye and demands attention. Bolding all words tires your mind.
- Underlines. Since 2000, they mean hyperlink. Don’t use it for emphasis.
- Who is your audience? I believe they’re experienced train drivers who spend long shifts standing up. They’re focused on what’s directly ahead of them, and if they have time to read, would probably be while they’re at a dead stop in a station.
- What is the environment? Any small sign will be on the driver’s dashboard, near important gauges the driver is constantly monitoring. The dashboard is dark, and the train is most likely in a dark tunnel while moving.