I mean, the real issue is that American traffic engineering is usually loathe to put anything other than a 4-way stop. Americans do not properly yield at yield signs, roundabouts take too much room, and we haven’t figured out how to routinely build speed bumps or raised crosswalks for less than six figures.

Also, it is a stretch to call some of that planning “learning” or “science.” As a general example, parking regulations for uses tend to be arbitrary, oversized and wildly out of date; most US retail parking lots are not full even on major shopping days like Black Friday before the advent of online, and now online is making all that space even more wasted.