This is weird, but I’ve confirmed this behavior time and time again. I have some motion sensors:
I’m generally happy with them, though I see the ratings are not great. Strangely, anytime a fire truck/ambulance goes by, despite their sirens NOT being on, it triggers motion. No other vehicle does this. They even get triggered through the garage door’s frosted translucent plexiglass, so no clear line of sight.
I’m guessing the fire trucks/ambulances are emanating something in the infrared, but it is weird.
Anyone else ever experience this?