minus-squareNarc082@aussie.zonetoNo Stupid Questions@lemmy.world•How does an automatic road barrier decide when a vehicle is coming?linkfedilinkarrow-up19·edit-21 year agoThis, it’s like a metal detector but, bigger. Temporary boom gates might use infrared motion sensors like automatic lights. edit: “lights” like the lights some people have on their porch. linkfedilink
This, it’s like a metal detector but, bigger. Temporary boom gates might use infrared motion sensors like automatic lights. edit: “lights” like the lights some people have on their porch.