• 0x4E4F@lemmy.rollenspiel.monsterOP
    link
    fedilink
    English
    arrow-up
    1
    ·
    1 year ago

    No, it actually measures vehicles if they’re short enough to pass. My guess would be a IR receiver-transmitter combo with a simple “flash if tripped” circuit, but still, that is enough to draw the driver’s attention.