Very seldom are they the correct size or are there enough of them. I consider the bare minimum of cones to be 12 to 14 per vehicle. All cones need to have reflective stripes if employees will be working in inclement weather or other reduced lighting situations. A planned work site is not an emergency. If you must use flags, they should be of the proper size, weighted at the hanging end, on the proper staff and reflective in diminished lighting situations.
Slow paddles are the preferred way to control traffic through a lane closing.
The paddles should be of the proper diameter and height for the conditions in your work zone. Normally, a PFAS would include a harness, lanyard, a rope or wire, and at least one or more anchoring points for the rope or wire. This is not the same type of life vest you would wear on a leisure boat trip. The vest must have the Coast Guard rating for work use. On a construction site you would normally find the general contractor providing this boat and personnel.