For a planned job site requiring flagging, which traffic control device is required to begin work?

To begin work on a planned job site requiring flagging, the necessary traffic control device is typically a "Stop/Slow" paddle. Here are the steps to use it:

1. Obtain the necessary traffic control device: This is typically a "Stop/Slow" paddle. This paddle is used to control traffic flow, with one side reading "Stop" and the other reading "Slow".

2. Position yourself: Stand on the side of the road, in a location where you are visible to oncoming traffic but safe from vehicles.

3. Use the paddle: When work is about to begin, display the "Stop" side to oncoming traffic. This signals to drivers that they must stop their vehicles.

4. Communicate with other flaggers: If the work site is large, there may be other flaggers present. Use radios or prearranged signals to communicate when it is safe to let traffic through.

5. Switch sides: When it is safe for vehicles to pass through the work site, flip the paddle to the "Slow" side and motion for drivers to proceed.

6. Repeat: Continue this process as necessary throughout the duration of the work.

Remember, safety is paramount. Always wear high visibility clothing and stay alert to changes in traffic or work site conditions.