Streetfilms: Tap Foot, Lights Blink, Cross Street

Along Seattle's historic waterfront I happened upon a unique pedestrian-activated crosswalk that blinks as people cross. Yes, I have seen over a dozen lighted ped signals before in myriad cities, but all required the user to press a button to manually begin the cycle. So, you ask, how is this one different?

Well check this out: As you enter the crosswalk, make sure to step on the yellow rectangle on the sidewalk. This activates the lights that line the crosswalk. Drivers stop and it should be safe to begin your adventure. You'll feel a bit like an airplane coming in for a landing. Frankly, it's very empowering and a lot of fun!

Reason dictates that A) there must be a sensor contained within the yellow pad, or B) there's a helpful gremlin who lives underneath and throws a switch for pedestrians. Regardless, anyone else seen one like it?