Here&#x27;s a pointer to a couple of engineering studies I found interesting, personally: <a href="https:&#x2F;&#x2F;www.motorists.org&#x2F;blog&#x2F;how-should-speed-limits-be-set&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.motorists.org&#x2F;blog&#x2F;how-should-speed-limits-be-se...</a>