The Most Annoying Thing About Cycling in Ottawa: Postscript

I was riding the shared bike path along the Ottawa River today and across from the War Museum on the pathway I noticed three yellow dots similar to the three yellow dots on roadways that mark where cars can activate traffic lights( I have tried using them on my bicycle with no effect). I can only assume that they serve the same purpose and, being on a bike path, are activated by bicycles. I returned via a different route so was not able to test them. However, if that logical assumption is true, it is doable. So why is it not done.

Previous Fifth Column Post