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Another point, and a key one as to why there generally aren’t “soft” speed bumps of any kind, is that a “squishy” material that is designed to have traction for a vehicle to go over it will have a bad mix of friction and torsion on the bump. It would take a lot of wear in a short span, compared with conventional bumps. The other thing is that even if a car is only going 5-10 mph over a speed bump made of non-Newtonian material, it’ll still probably harden up due to the forces at play at that speed.you don’t need an engineer, an uneducated guess would be pretty spot on why this is a terrible idea and never caught on, to adjust it to work and get hard at certain speed would assume all car vehicles are the same weight, which they’re not, and you also have trucks and motorcycles. To be more specific, it’s the force of the object that matters here. Sure, weight is related to mass and force is a function of mass. You could easily make the comparison that a motorcycle is less massive than a car so obviously a car would be affected more. But that’s not exactly the case, because the force in question is a surface force and the area over which the force is applied from the car is larger than a bike. Cars have 2 wheels contacting with a larger area than a motorcycle with 1 wheel and smaller area. I don’t know for sure, but it seems plausible that the ratio of tire area to force by mass could be relatively similar.

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