Shaped traffic lights for the colour blind

Many people don't know this, but in Quebec and a few other eastern provinces in Canada, the traffic signal lights don't just have different colours, they also have different shapes - for people who are colour blind. The green is round, the yellow is a diamond shape and the red is a large square.

In Quebec, there are often two reds as well, one at each end of the light grouping. It is also common to find green arrows instead of just a green circle.