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Watch The Secret Genius of Modern Life Season 3 Episode 5 online. Maybe available on Youtube, Netflix, PrimeVideo, Hulu, Disney and other legal streaming platforms.

Britain's 2,300 miles of motorway are the backbone of the country, and without them, it'd probably all grind to a halt.Hannah takes a drive to the National Highways control centre for the UK's busiest motorway to meet the team that keep these super-roads running 24/7. And she discovers how a mathematician with a passion for wild swimming, a Formula 1 legend and a 1960s road-sign revolution created the modern motorway.