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Toolbox talk · 10 min · Driving & Vehicles

Work Zone Flagging

Hazards: Struck by an errant vehicle entering the work space · Struck by construction equipment backing or turning inside the zone · Driver confusion from unclear or non-standard signaling · Reduced visibility at night, at dawn and dusk, or in rain and glare

Why it matters

A flagger stands in the open with nothing between them and traffic, and controls drivers who are distracted, impatient or simply not looking. That is why 29 CFR 1926.201(a) hands the whole subject to Part 6 of the MUTCD — the paddle, the signals, the station and the garments. The current book is the 11th Edition, December 2023. Everything below is what it actually says, and most of it is a Standard, not a suggestion.

Key points

  • Paddle first, flag only in emergencies. The STOP/SLOW paddle is octagonal on a rigid handle, 18 in minimum, retroreflectorized at night. Hand movements alone are prohibited.
  • Class 2 or 3 in the zone, Class 3 at night. ANSI/ISEA 107-2015 apparel for everyone inside the TTC zone; the employer's designated person picks the class. Night flagging: Class 3.
  • Stand alone, and stand visible. On the shoulder or in the closed lane — step into the live lane only after traffic has stopped. Away from the crew, the trucks and the equipment.
  • Know your escape route before you take the station. The MUTCD asks the flagger to identify one, and asks that the station leave an errant vehicle room to stop short of the work space.
  • Signals are fixed, not improvised. STOP: face traffic, paddle held out, free hand palm up above shoulder. SLOW: paddle out, motion the free hand. Never wave a flag to send traffic through.
  • Signs come before the flagger, light comes before dark. Advance warning signs are required except in emergencies, and the station must be illuminated for night work.
  • Two flaggers means one coordinator. On a one-lane two-way setup they must be able to talk — voice, radio or agreed manual signals that cannot be mistaken for flagging.

Do / Don't

Do

  • Face traffic and keep your eyes up the whole shift.
  • Keep the paddle high, steady and square to the driver.
  • Warn the crew when a vehicle is not slowing — horn or whistle.
  • Get relieved regularly; a tired flagger stops watching.

Don't

  • Direct traffic with your hands, a hard hat or a shovel.
  • Stand in front of parked equipment or with your back to the lane.
  • Use your phone, headphones or earbuds on station.
  • Argue with a driver — note the plate and let them go.

Quick site check

  • Every flagger names their escape route before taking station.
  • Check paddles for cracks and reflectivity, and vests for the ANSI 107 class label.
  • Walk the approach and confirm the advance warning signs are up, visible and in order.
Discussion — ask the crew
  1. Where would you go if a car came through the taper right now? Name your escape route out loud.
  2. Is our flagger standing alone, or bunched up with the crew and the trucks?
  3. What class of vest is everyone wearing today, and does it change tonight?
  4. Which approach here has the worst sight distance, and how far back is the advance warning sign?
  5. How do our two flaggers talk to each other, and what happens if that fails?
Refs: FHWA MUTCD 11th Edition (December 2023), Section 6D.01 — Qualifications for Flaggers: the five abilities a flagger should be able to demonstrate, and training in traffic control practices and public contact techniques · FHWA MUTCD 11th Edition, Sections 6D.02, 6D.03 and 6D.05 — STOP/SLOW paddle preferred and octagonal on a rigid handle, retroreflectorized at night, 18 in minimum; flags limited to emergencies, red or fluorescent orange-red, 24 in square on a 36 in staff; the exact paddle and flag signaling methods; hand movements alone prohibited · FHWA MUTCD 11th Edition, Section 6D.06 — Flagger Stations: sufficient stopping sight distance, space for an errant vehicle, an identified escape route, advance warning signs, and illumination when flagging at night · FHWA MUTCD 11th Edition, Section 6C.05 — High-Visibility Safety Apparel: ANSI/ISEA 107-2015 Performance Class 2 or 3 for all workers in the temporary traffic control zone, Class 3 recommended for flaggers at night, background fluorescent orange-red or yellow-green · 29 CFR 1926.201(a) — Signaling: signaling by flaggers and the use of flaggers, including warning garments worn by flaggers, shall conform to Part 6 of the MUTCDSign-in sheet included in the printed version

Frequently asked questions

Yes, by reference. 29 CFR 1926.201(a) states that signaling by flaggers and the use of flaggers, including warning garments worn by flaggers, shall conform to Part 6 of the MUTCD. So a flagger working outside MUTCD Part 6 is an OSHA issue as well as a traffic issue.

Paddle. MUTCD Section 6D.02 says the STOP/SLOW paddle should be the primary and preferred hand-signaling device because it gives road users more positive guidance than red flags, and 6D.03 says use of flags should be limited to emergency situations. Under 6D.05, hand movements alone without a paddle, flag or AFAD are prohibited for controlling one-lane two-way traffic.

The STOP/SLOW paddle shall have an octagonal shape on a rigid handle and be retroreflectorized when used at night; Figure 6D-1 shows an 18-inch minimum face. Flags, when used, shall be red or fluorescent orange-red, a minimum of 24 inches square, securely fastened to a staff about 36 inches long, and retroreflectorized at night.

Under MUTCD Section 6C.05, all workers within the temporary traffic control zone shall wear high-visibility safety apparel meeting ANSI/ISEA 107-2015 Performance Class 2 or 3, and a person the employer designates for worker safety selects the class. For flagger wear during nighttime activity, the MUTCD says Class 3 apparel should be worn.

MUTCD 6D.05 guidance: on the shoulder next to the road users being controlled, or in the closed lane before stopping traffic, only stepping into the moving lane once vehicles have stopped. The flagger should stand alone, away from other workers, work vehicles and equipment, and should be clearly visible to the first approaching driver at all times.

Section 6D.06 guidance states that flagger stations should be located such that an errant vehicle has additional space to stop without entering the work space, and that the flagger should identify an escape route that can be used to avoid being struck by an errant vehicle. Pick it before you take the station, not during.

Two things in Section 6D.06: except in emergency situations, flagger stations shall be preceded by an advance warning sign or signs, and flagger stations shall be illuminated when flagging is used at night. The paddle or flag must also be retroreflectorized.

MUTCD 6D.01 is written as guidance rather than a mandate, but it is explicit about why: because flaggers are responsible for public safety and make the greatest number of contacts with the public of all highway workers, they should be trained in proper traffic control practices and public contact techniques. Many states and owner agencies turn that into a hard certification requirement — check the contract.

Sources & references

Content checked against these sources — last reviewed August 28, 2026.

Results are estimates for planning purposes and do not replace a competent person's evaluation or an engineer's design. Follow the OSHA standards that apply to your work and your employer's written program.

By — Editorial team of SteelToeTools.com (published by LSEA SAS) Updated