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Start with the basics.
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Fundamental Principles

The principles listed below provide a guiding philosophy of good temporary traffic control and enhance the safety of motorists, pedestrians, and workers in the vicinity of temporary traffic control zones.

1.Make traffic safety and temporary traffic control an integral and high-priority element of every project from planning through design, construction, and maintenance.

2.Inhibit traffic movement as little as possible.

3.Provide clear and positive guidance to drivers and pedestrians as they approach and travel through the temporary traffic control zone.

4.Inspect traffic control elements routinely and make modifications when necessary.

5.Pay increased attention to roadside safety in the vicinity of temporary traffic control zones.

6.Train all persons that select, place, and maintain temporary traffic control devices.

7.Establish proper legislative authority to implement and enforce needed traffic regulations, speed zoning, parking controls, and incident management.

8.Keep the public well informed.

9.If there is a side road intersection or ramps within the work area, additional traffic control, such as flaggers and appropriate signage, may be needed on the side road approaches or ramps.

10.Good judgment must always be used to determine the final traffic control setup.

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Supervisor‘s Checklist

1.Have a traffic control plan before going to the work site.

2.Ask yourself, “What is the driver‘s view of the work site”, (at night, during peak hours, etc.) Whenever possible, after setting up, drive through the zone to see it from the motorist perspective.

3.Investigate crashes/incidents to identify if changes are needed in the traffic control plan.

4.For overhead work, traffic control is required for affected lane(s).

5.If working on an interstate, check to see if an interstate Lane Closure Waiver is needed and/or approved for the location.
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Any lane closures on two lane roads, regardless of the shoulder or length of work requires a minimum of two flagmen. (pg. 58)
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ALL of the preceding takes place on a nice, bright, sunny, spring day.

Completely blocking the traffic lane of a two lane road in adverse weather? !! ??!!!

And people are blaming all the drivers spinning off into oblivion !!