What does this street sign mean?

As seen in Quebec city. A round street sign with a white background and a red border. In the middle is a line diagram (black). At the top of the diagram is a horizontal line. Descending from this line are two diverging black lines (at a ~45 degree angle). Both of these to lines has a circle at the bottom of them.... show more As seen in Quebec city. A round street sign with a white background and a red border. In the middle is a line diagram (black). At the top of the diagram is a horizontal line. Descending from this line are two diverging black lines (at a ~45 degree angle). Both of these to lines has a circle at the bottom of them.
What does this sign mean?
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