Appreciating Colour - red and green signs in contests

Problem
In Toastmasters Clubs the speech timer uses red and green boards to show the green you've spoken enough and can go on or go and leave the stage and red for you've reached the time limit and must stop.

Traffic lights are relatively easy to distinguish because the top one of the three lights is red. the middle one is yellow. The lowest one is green. But if you turn the lights sideways on a desk instead of standing them upright, the colour blind speaker loses the vertical clue.

However, people who have red green colour blindness cannot distinguish colour boards.

Answers
At HOD Toastmasters Club in London, England, at the request of a previous president, who was colour blind, we now print the word green in black on the green card, and the word red in black on the red card.

Author
Angela Lansbury, author and speaker.