I flagged for 6 months state roads fema storm cleanup.
Never trust drivers, always plan an exit (over guard rail)
On 55mph rds we stopped traffic.
Empty tractor trailers are hard to stop. So give people room. Seen a few tractor trailer drivers swinging their smoking hopping trailers out as they pass the stop point as I climb over guard rail.
So look at lay of road corners hills, place flaggers appropriately.
Working on site biggest danger I saw was crew feeding chippers on traffic side backs up to avoid limb in face right into road a cars passing.
In slower non stopping traffic sites,I like to set a cone or few that I can see out of the corner of my eye to stop myself and delineate the work zone for drivers.