there doesn't seem to be anything on this page to explain traffic theory verbally or written, and without that the visual aspect is useless.
unless maybe the full page isn't loading for me?
I'm on latest version of chrome on a mac
You can get a verbal explanation by toggling "show video" at the top.
After about two seconds of video the page turns all white. Not sure what's up with the page, maybe they're triggering my ad blocker (Firefox Tracking Protection + uBlock Origin)?
I ran into that problem, so I refreshed it worked through the whole video.