That would not be good. I have watched crews put warning flags and cones 50 feet behind the truck which is way too close to be safe.
If someone is going to hit hard enough, then cones and signs help zero.
I have been advocating for crash trucks.
In Seattle, with the prog-lib gov't we have, many people are driving around high these days because SPD and King County have a policy to ignore drug use, possession or prosecute for such. People feel emboldened to drive around high. We have had several bad incidents already in the last 5 years.