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Comment on The first driverless semis have started running regular longhaul routes | CNN Business

Large neodymium magnet on the bottom will do it. Most are induction activated. They taught this in every motorcycle driving class I ever attended, along with the rules for legally running a red light.

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pirat@lemmy.world ⁨3⁩ ⁨weeks⁩ ago
That way you’ll also automatically collect all sorts of valuable metal treasures along the route. For free!!

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- PattyMcB@lemmy.world ⁨3⁩ ⁨weeks⁩ ago
  At least the screws won’t collect in your tires! Lol
  
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RubberElectrons@lemmy.world ⁨3⁩ ⁨weeks⁩ ago
No, it won’t. I invite you to get some large magnets and place them directly on the loop cuts in the street.

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- fishos@lemmy.world ⁨2⁩ ⁨weeks⁩ ago
  Well yeah, they have to move over the sensor loop. You can’t just place it in the center. It’s part of a process that happens as, you know, you pull up the the light. They are a little fancy.
  
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  - futatorius@lemm.ee ⁨2⁩ ⁨weeks⁩ ago
    This guy inductions.
    
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  - RubberElectrons@lemmy.world ⁨2⁩ ⁨weeks⁩ ago
    Thanks dude, well aware they’re looking for an AC signal. The added magnet isn’t going to influence that, is my point.
    
    Besides limited magnetic permeability of the magnet itself (the thing the loop is looking for), it’s physically not big enough. What you really need is an amplified field distortion, e.g. a field coil which reads the sinusoidal signal being emanated by the sense coil, and loudly plays the inverse back so the sense coil thinks a giant block of steel slid over it.
    
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