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75% More Pedestrians Have Been Killed Since 2009. Giant Trucks and SUVs Are Why (www.thedrive.com)
submitted 2 months ago by to c/technology@lemmy.world
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[–] 1 point 2 months ago (8 children)

Thats not how kinetic energy works, no pedestrian is heavy enough to stop any car, small or large.

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  • [–] 20 points 2 months ago (1 child)

    Bigger in the context of vehicles means not only heavier, but also a higher point of impact. It could be the difference between getting hit in the legs vs the torso. Or the difference between rolling onto the hood vs knocked down and run over.

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  • [–] 7 points 2 months ago*

    A higher kinetic energy means the vehicle takes longer to stop from the same speed (that's true even with better brakes and better tires, because if you try to reduce the energy faster than a certain rate the vehicle just starts skidding) which in turn means collisions with pedestrians happen at a higher speed, which is more deadly.

    I couldn't find a page of info for specifically light trucks, but here's one for trucks.

    This is not to deny the effect of higher fronts and hence lower driver visibility, just to point out that kinetic energy too matters.

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  • [–] -1 points 2 months ago* (last edited 2 months ago) (2 children)

    Kinetic energy is related to mass and the square of velocity

    A heavier vehicle absolutely has more killing power against a pedestrian...

    You're right. The mass of the pedestrian makes no difference... any vehicle is going to turn them into a red mist

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  • [–] 4 points 2 months ago (1 child)

    You have it backwards. Larger vehicles of course have more energy, but pedestrians are too light for that to make a difference.

    If you get hit by an oil tanker ship going ~1 kmh, that ship has orders of magnitude more kinetic energy than a car at highway speed, yet, unless theres a wall or something, the ship will merely push you harmlessly aside.

    Its about the manner of delivery, not the vehicles energy.

    Larger cars are more dangerous because they hit you higher up, where you have more vital organs.

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  • [–] 1 point 2 months ago*

    The danger from higher kinetic energy comes from the longer break distance and time to stop: given the same driver reaction time and distance to the pedestrian, a heavier vehicle will take longer to break to a stop and thus have a higher velocity when it collides with that pedestrian than a lighter vehicle.

    This is not to deny the difference that a higher front makes, just pointing out that kinetic energy does in fact make a difference, though of course as you point out not because of any "higher energy transmission on collision" or such, but rather indirectly because the vehicle is more likely to collide at a higher speed because it takes longer to break.

    I couldn't find info on this for explicitly for light trucks, but here's some for trucks.

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