If you’ve ever hit a speedbump without slowing down, you know the anxiety they can cause. However, these “adaptive” speedbumps are able to change their intensity depending on how fast the offending vehicle is traveling. A Spanish company named Badennova designed and started testing the fluid-filled road obstacles years ago, but they haven’t quite become mainstream yet. Regardless, you’ll think twice about flying through the parking lot after hitting one at speed.

The idea here is that, at low speeds, the speedbump allows a vehicle to roll over it without much consequence, but at higher speeds, it will provide quite a jolt to the vehicle and its occupants. It seems like a massively futuristic approach to speed enforcement, but the technology behind it isn’t all that new. 

The video doesn’t do much to clarify this, but it’s essentially a practical application for what is known as a non-Newtonian fluid. Across the internet, you can find several examples of people gently poking a finger into a large vat of this fluid with ease, but then after trying to punch that liquid, they find that it’s rock hard. In other words, non-Newtonian liquids behave differently than standard liquids, like water or gasoline, which both maintain the same level of viscosity regardless of how they’re being handled. Non-Newtonian liquids change viscosity in certain situations, so they feel like a thick liquid with a gentle poke, but turn into what feels like a solid when punched. 

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