The concept here makes sense: There are flashing yellow lights above the crosswalk and embedded in the road, and you activate them by hitting the button before you cross. In theory, this should make approaching drivers more likely to notice you.

But there’s just something amusing about the phrase, “Crosswalk warning device.”

My first thought was, why the extra arrow? It’s pointing in the same direction as the sign. And it means you have to press the button carefully instead of just whacking it with your hand. The answer hit me later in the walk. I was leaning on the button with my hand when the light changed, I and felt the button vibrating. Of course! It was for blind pedestrians!

The raised arrow makes it easier to hit the right button, rather than just hope that the buttons have been placed in standard orientation. And vibrating the button makes it clear not only that it’s safe to cross, but in which direction it’s safe to cross. That’s one thing I could never figure out about the chirping walk signs in San Diego. It tells you the light’s changed, but if there’s any indication as to which light is green, I’ve never noticed it.