[dfe]

Correct.

Whoever downvoted your comment has either never driven this stretch of the 5 or they are the reason it is so bad.

It’s the idiots in cars who insist on doing exactly 65 in the left lane next to a semi that cause the problem. Get past just one idiot holding back hundreds of cars and you will find miles of completely open road.

[olyjohn]

Its all of those rolling hills where you are going up and down over and over. People don't pay attention and let their car slow down up hills, then let their cars roll up to 90 going back down the other side. Do it over and over and you get the whole centepede effect, except cars far enough back have to practically stop.