The Flood Ate the Hill (The Road Was the Easy Part)
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From a channel a BrighterTube curator vetted · found via Reddit r/AskScienceDiscussion thread: I put together a list of science YouTube channels · 80% confidenceFrom a channel Lumen includes in full: Road Guy Rob, a practising civil engineer, explains how roads, intersections, traffic signals and transportation planning actually work, with real design standards and data; the r/AskScienceDiscussion thread calls it absolutely top notch.
A 17-minute video from Road Guy Rob's catalogue; the title names its topic.
Video by Road Guy Rob, played through YouTube's embedded player.