Are the standard stop slow traffic control methods safe enough in 2019?

In 2019, are the standard stop/slow methods of traffic control safe enough to protect traffic controllers or do they pose unacceptable risks? And if so, how can safety be improved?

68d3b6089d02d7a26d3e89fdf723681d uploads 94 screen shot 2019 03 11 at 12.49.12 pm