Recently, I noticed that Ala Moana now indicates how many open parking stalls are in the various parking areas. As you go up the Keeaumoku entrance ramp, you’ll see the big board counting all the open spaces (sorry, I don’t have a pic). I had seen this on the mainland but never in Hawaii.
I wondered how it got its data then I finally (and painfully) looked at the new-ish LED lights in the structure. Nestled between the left and right LED lights is what I’m guessing to be the sensor.