Work Zone Traffic Control & Flagging Calculator
Lay out a temporary traffic control zone with the MUTCD Part 6 formulas — taper lengths, buffer space, advance warning sign spacing and channelizing devices — and budget flaggers, signs and devices.
Work Zone Traffic Control & Flagging Calculator — ConcreteNear.com
| L = W·S | 540 ft |
| Buffer space (longitudinal) | 360 ft |
| Sign spacing A / B / C | 500 / 500 / 500 ft |
| Advance warning area (A + B + C) | 1,500 ft |
| Channelizing devices (cones / drums) | 26 · ≤ 45 ft apart in tapers, ≤ 90 ft along the work |
| Warning signs | 8 |
| Downstream taper | 100 ft · 50–100 ft per lane |
Cost estimate U.S. average prices
| Flaggers (2, +½ hr setup each per day) 17 hr × $25.02 × 2 | $850.68 |
| Set up & remove signs and devices 1 job-day × $350.00 | $350.00 |
| Warning signs 8 sign-day × $0.25 | $2.00 |
| Cones / drums 26 device-day × $0.12 | $3.12 |
| Estimated total | $1,206 |
- Flaggers must be trained to your state's standard and wear high-visibility (ANSI/ISEA 107 Class 2 or 3) apparel.
- This is planning math only — a temporary traffic control plan from a qualified designer and any agency permit govern.
| Inputs | |
| Work zone | Two-lane road, one lane closed with flaggers |
| Posted speed (or 85th-percentile) | 45 mph |
| Road type (for sign spacing) | Rural |
| Lateral offset (usually the lane width) | 12 ft |
| Work area length | 300 ft |
| Flaggers | 2 |
| Hours per day | 8 hr |
| Days | 1 days |
| Message boards (PCMS) | 0 |
| Police officer hours (total) | 0 hr |
Planning estimate only — confirm with your supplier or contractor.
Prices used — edit any price to match your local quote
| Item | Unit price | Basis & source |
|---|---|---|
| Construction laborer / flagger wage per hr | public source BLS OEWS May 2025, 47-2061 Construction Laborers mean hourly wage (flaggers are classified here) (May 2025) | |
| Traffic-control setup & takedown (short job) per job-day | starting estimate Starting estimate for a traffic-control company to deliver, set and remove signs and devices on a short job. | |
| Work zone sign per sign-day | public source Florida DOT Item Average Unit Cost 2025, item 0102 60 Work Zone Sign (per each-day, 321 contracts) (2025 lettings) — Long-duration DOT price; short rentals from a traffic-control company cost far more per day. | |
| Channelizing device (cone/drum) per device-day | public source Florida DOT Item Average Unit Cost 2025, item 0102 74 1 Channelizing Device (per each-day) (2025 lettings) — Long-duration DOT price; short jobs usually pay a per-job setup charge instead. | |
| Labor markup (wage → billed rate) per × | starting estimate Starting estimate covering payroll taxes, insurance, benefits, overhead and profit. Many contractors land between 1.6× and 2.5×. |
How to use this calculator
- Pick the work zone type.
- Enter the posted or 85th-percentile speed and lateral offset.
- Pick the road type for sign spacing.
- Enter crew hours and days for the budget.
Formulas
Merging taper L = W × S² ÷ 60 for speeds of 40 mph or less; L = W × S for 45 mph or moreShifting taper = ½ L; shoulder taper = ⅓ L; one-lane two-way (flagger) taper = 50–100 ftDevice spacing ≤ S (ft) in tapers and ≤ 2S along the work area
Questions
How long should a taper be at 45 mph?
For a 12 ft lane closure at 45 mph, L = 12 × 45 = 540 ft.
How far apart are advance warning signs?
MUTCD Table 6C-1 suggests 100 ft (urban low speed), 350 ft (urban high speed), 500 ft (rural), and 1,000/1,500/2,640 ft on expressways and freeways.
Is this a traffic control plan?
No. It is planning math. Your agency's standards and a qualified designer's TTC plan govern.
Sources & assumptions
Prices checked 2026-11-10. State pricing multiplies national figures by the U.S. Bureau of Economic Analysis regional price parities (goods for materials, services for labor and services). RPPs compare general consumer price levels (U.S. = 100). They are not construction-specific; we use RPP Goods for materials and RPP Services: Other (excludes rents) for labor and services.
- Construction laborer / flagger wage — BLS OEWS May 2025, 47-2061 Construction Laborers mean hourly wage (flaggers are classified here) (May 2025)
- Work zone sign — Florida DOT Item Average Unit Cost 2025, item 0102 60 Work Zone Sign (per each-day, 321 contracts) (2025 lettings). Long-duration DOT price; short rentals from a traffic-control company cost far more per day.
- Channelizing device (cone/drum) — Florida DOT Item Average Unit Cost 2025, item 0102 74 1 Channelizing Device (per each-day) (2025 lettings). Long-duration DOT price; short jobs usually pay a per-job setup charge instead.
- Arrow board — Florida DOT Item Average Unit Cost 2025, item 0102 76 Arrow Board / Advance Warning Arrow Panel (per each-day) (2025 lettings)
- Portable changeable message sign — Florida DOT Item Average Unit Cost 2025, item 0102 99 Portable Changeable Message Sign (per each-day) (2025 lettings)
- Law-enforcement traffic control officer — Florida DOT Item Average Unit Cost 2025, item 0102 14 Traffic Control Officer (244 contracts) (2025 lettings)
Starting estimates No public price series was found for: Traffic-control setup & takedown (short job); Labor markup (wage → billed rate). These defaults are editable placeholders — replace them with a local quote.
Results are planning estimates, not quotes or engineering advice. Codes, specifications and your supplier's numbers govern.
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