I like the core message that cyclists take the whole lane when appropriate and share when appropriate. "Allowed use," and "May take" do seem like useful driver education.

I do not like the notion of signage telling me when to take the lane or share it. In some settings, say dense low speed motor traffic when just puddling along, I am happy to share a marginal lane. In other settings, say glass and other debris on the right, I will take a wide lane.

There's also the issue of driver perception when signs are not present. If road "A" is signed "May take," what about road "B" that is unsigned? Readers here know full well we are responsible for making our own choices on "B," but your average driver does not.

The most import thing I learned reading here is that I am responsible for making it perfectly clear by my position when I am sharing and when I am taking.