[oldandtired]

Here in Victoria (Australia), we commonly see road signs stating that "speed kills" whereas the reality is that it is the jerk that kills.

[rcxdude]

No, it's the acceleration. That's what produces the forces. But there is usually a correlation between jerk and acceleration in a collision, given a certain amount of energy (speed^2)

[oldandtired]

I didn't think my play on words would cause such controversy about acceleration and jerk. Mayhaps I should not be making "Dad jokes" here.

[selimthegrim]

WBRTC in India used to have noticeboards and buses painted with “Safe Drive Save Life” and “Save Drive Safe Life”

I’m not sure anyone noticed the difference between the two

[nayuki]

Here are my interpretations:

* If you drive safely, then you can save someone's life by avoiding a crash.

* If you save a driving trip (and instead walk/bike/transit/stay-home), you will have a life of safety.

[mauvehaus]

As Jeremy Clarkson put it "Speed never killed anybody. Suddenly becoming stationary? That's what gets you."

[selimthegrim]

I have a pair of matching Nike socks, where one of them said that, and the other one replies “fast is faster”

[Gooblebrai]

If you want to be pedantic, you could argue that it is the collision that kills.

[samatman]

It isn't, though. It's the jerk.

The difference between falling from a height and landing on a trampoline, and landing on concrete from the same height, is that the trampoline smoothly accelerates you to a halt once you collide with it. The concrete does so much more rapidly: that's jerk. Both of these are collisions with the same amount of force behind them.

[user_7832]

Is it not life that kills?