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> A good acceleration is improving safety.

Unclear this is the case, why do you say so?

Merging, overtaking, etc..

Safely merging and overtaking doesn't involve hard accelerations, though. Unsafely doing those things, sure.

Can you imagine passing a tractor going 35 on a 55 two-lane country road in a 2500 lb car with 110 horsepower?

Uh, yeah? You wait until you know there are no oncoming cars, or until the tractor slows down to let you pass.