Engineering from first principle tells us that roads where cars interact with unprotected humans should have a limit of 20 mph. I&#x27;m not sure if this is such a road but overall, because of physics, speed isn&#x27;t really up for debate.<p>Edit: Also really sad to see this get removed, flagged(?), from the front page. It was a really cool hack. HN is all about BS and not technology these days it seems.