Here's a great video from Bobke TV, where a recreational cyclists tries to emulate Chris Froome's descending position on a publc road, in traffic!

In short don't do it! The pros get paid to ride, train for years to hone their bike handling skills, and they ride on roads closed to normal traffic.

Let's go to the video:

https://www.youtube.com/watch?v=eOomGU0lsJM