So just something that’s been on my mind. At my workplace there’s an automatic road barrier that lifts up and down when vehicles arrive. However, it’s not used for a carpark system when people wave their tickets or something. It just goes up and down when a vehicle shows up.
However, it sometimes goes up for when say a pushcart is being rolled over whereas it wouldn’t for a guy pushing a bin.
So tldr, how does an automatic road barrier decide that yes, a vehicle is coming, and therefore opens up?
There could be a motion sensor behind maybe? It could be one of those places that have a bunch of coils on the ground, wherein a large enough mass of metal gets detected by changing magnetic or electric fields, or something else entirely