Slow to the posted work-zone speed limit, follow temporary signs and flaggers, leave extra room ahead, and watch for workers, equipment and sudden traffic changes. At a lane closure, merge early if traffic is moving freely; when congestion closes gaps, use the open lane to the merge point and take turns.
Adjust your speed and follow the signs
Obey the posted work-zone speed limit and any directions from flaggers. If there is no reduced speed limit sign, the National Highway Traffic Safety Administration (NHTSA) says to follow the normal posted limit; slow further when traffic, a flagger or conditions require it. A work zone can change as you travel through it, so keep scanning for temporary signs, cones, barrels and lane instructions rather than assuming the pattern will stay the same.
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Speed is not a minor concern: a Federal Highway Administration (FHWA) factsheet published in 2026, using NHTSA FARS 2024 Annual Report File data, reports that speed was a factor in more than one-third of fatal work-zone crashes in 2024. Read the FHWA 2026 work-zone awareness factsheet.
Leave room and anticipate sudden changes
Increase your following distance so you have more time to react if traffic slows or stops. Watch the vehicles ahead, not just the cones: work zones may include abrupt lane shifts, alternating closures and short queues. Avoid following another vehicle so closely that it blocks your view of signs or a flagger.
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Rear-end collisions accounted for nearly one-quarter of fatal work-zone crashes in 2024, according to the same FHWA factsheet. Be especially alert when approaching a queue, a flagger or a change in lane alignment.
Choose the right merge for traffic conditions
There is no single merge point that is safest in every situation. Base your choice on whether traffic is moving freely, whether speeds differ between lanes and whether gaps remain open.
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| Traffic conditions | What to do |
|---|---|
| Light traffic, moving freely, with open gaps | Merge early when it is safe to do so. Signal, check mirrors and blind spots, and move into the open lane without forcing another driver to brake. |
| Congestion, slow speeds and gaps closing | Use the open lane up to the merge point, then take turns with drivers in the continuing lane—the zipper method. Do not try to race ahead or block the open lane. |
NHTSA and FHWA both recommend early merging in free-flowing traffic and a zipper merge when congestion slows traffic and gaps close. See NHTSA’s Work/Construction Zones guidance and FHWA’s dynamic lane-merge guidance.
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Watch for workers, equipment and people outside vehicles
Look beyond the traffic in front of you for workers, construction vehicles, machinery and pedestrians. Workers may not be visible immediately after a warning sign, and some work zones move. Follow flagger directions, stay in your lane as instructed and leave as much room from workers and equipment as the roadway allows. At night, use extra caution and adjust your lane position away from workers or equipment when possible, without crossing lane markings or creating a hazard.
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FHWA’s 2026 factsheet reports that nearly 170 pedestrians—including construction, maintenance and utility workers—and pedalcyclists were killed in U.S. work zones in 2024. The same factsheet says distractions were involved in more than one in eight fatal work-zone crashes. Put your phone away and avoid other distractions so you can respond to changing conditions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Plan for delays and stay alert to the end
Allow extra time before you set out. If avoiding the work zone is practical, choose an alternate route; otherwise, expect slower travel and remain patient. Keep following signs and flagger instructions through the full work area, including any lane shifts, until you reach the “End Road Work” sign.
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The figures above describe U.S. work-zone crashes. FHWA cautions that its work-zone statistics depend on law-enforcement reports identifying a crash as occurring in a work zone, so some crashes may be undercounted. For driving, signs, flagger directions and applicable state or local traffic rules take precedence. FHWA’s work-zone facts and statistics.
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