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Where are these mythical big, fast, wide roads?

Every road I know, no matter how wide, is slow. And making it wider doesn't help because of induced demand.

For example check Eisenhower drive in La Quinta, California: https://maps.app.goo.gl/YdaSTfX9YwrXmU1MA

I'm not sure I buy the concept of induced demand. If you widen a road and it results in more traffic, that sounds like there was already more demand than supply.

Induced demand should really be called "insurmountable demand." If there's a million more people who would take a traffic-clogged freeway if it were moving at 6mph, then it will always be clogged with traffic.

Have you read anything or watched anything about induced demand or did you just read the expression and figured it all out by yourself?

https://www.youtube.com/watch?v=za56H2BGamQ

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