Minh Nguyen
Stanford maintains an outdoor warning siren somewhere in the Arboretum near Arboretum Rd. as part of the AlertSU system, but I can’t find it in Bing Streetside imagery. It’s probably a little further from the street. Everything that looks like a possible siren in aerial imagery turns out to be one of the mobile floodlight units that Stanford deploys when turning the arboretum into a parking lot on gamedays.