In late December of 2017 I took some 2 to 6 minute videos of sections of an `all weather' local training route. THIS is a link to the RWGPS map of the route.
Below is a link to the videos
SKULL VALLEY TO KIRKLAND AND BACK
On a few of the descents I used the `luge' method of removing the right foot from the pedal and extending it over the pedal. This reduces some wind resistance and increases stability when descending. I usually don't do this until I exceed 35 mph. Usually (sometimes, with a strong tailwind, I increase the RPMs into the 40 mph range).