Years ago I worked for NYS DOT as a flagger for 6 months. Got schooled and certified. Our crew was 4 guys two 1/2ton pick ups a bunch of signs and radios.
We had to assess the curves, hills and other blind spots with respect to our work sites as where to set up the signs. This was before cell phones too. Friday afternoons were nuts.
Here is a golden rule of safety applicable to road work and applies every where in life...Never trust other people when they can hurt you...unless, you know they can see you and or you can communicate with them.
I think bicycle riders pedaling with their backs to traffic riding the white line cause there is no shoulder are fucking insane. Never surprised when one gets hit.
We set up cones for us. We use them as danger zone markers for us. We set them near the chipper as markers for our peripheral.
Imagine getting smacked in the face when feeding the chipper and turning away into traffic?