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Before you leave, check the official state or local road-information service for construction, closures, detours, delays and weather. If a suitable alternate route avoids the work zone, use it; if not, follow the posted detour and work-zone signs, obey the speed limit and keep your attention on the road. Because 511 services and update details vary by location, check the agency serving your trip rather than assuming one app has the full picture.
Start with official road information
Look up the state department of transportation (DOT) or local agency responsible for the roads on your trip. Its traveler-information website or 511 service may show planned or active construction, lane restrictions, full closures, detours, incidents, weather and reported delays. Coverage and features differ among jurisdictions, so confirm that the service covers the roads you plan to use.
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511 is a nationally designated traveler-information number, but states and local agencies largely determine how the service is implemented and what information it provides. The Federal Highway Administration’s 511 overview explains that decentralized approach; it is background, not a guarantee of current coverage in any particular place. Where calling 511 is available, use it before driving or have a passenger check. Do not handle a phone while driving to find updates.
For a route that crosses state or local boundaries, check each relevant agency. A service for one jurisdiction may not include restrictions just across its border. General-purpose navigation can be useful for planning, but federal guidance does not establish that any particular commercial app has complete work-zone information.
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When you check, search both the route you expect to take and the corridors you might use instead. An alert about a closure is useful only if you know which segment it affects and whether it changes the route you are considering. Look for the status of the work (planned or active), any lane or road closure, the posted or agency-recommended detour, and delay information. If the trip crosses jurisdictions, repeat the check on the relevant state or local sites rather than assuming one agency’s map covers the whole trip.
Online traveler information is a planning aid, not a promise that every restriction will appear immediately. FHWA materials describe information channels that depend on updates from transportation agencies; they do not guarantee that every platform receives every update at the same time. A missing alert therefore does not prove that a road is clear. Recheck near departure and continue to rely on current signs and conditions once you are on the road.
Compare routes for safety and practicality
When a work zone appears on your planned route, look for a reasonable alternative. FHWA’s April 22, 2025 safety notice advises drivers: “Find another route, where possible, to avoid work zones.” The qualification matters: an alternate may not exist, may be closed itself, or may not suit your vehicle or trip.
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Compare the available choices using current conditions, not just distance or the first route suggested by a map. There is no universal scoring formula for the safest route, but these checks can expose a poor detour before you commit:
- Closures and detours: Check whether either route has a current closure, lane restriction or official detour. A route that looks shorter on a map may be unavailable.
- Delay and timing: Compare reported delays and consider when you will reach the work area. Conditions can differ by time of day, and the agency’s estimate is time-sensitive.
- Road and weather conditions: Check relevant weather and road reports. A longer alternative is not automatically preferable if conditions make it unsuitable.
- Route complexity: Consider whether the alternative introduces unfamiliar roads, difficult turns or complex merges. A reroute should be one you can follow without last-second maneuvers.
- Vehicle suitability: Confirm the roads and detour are appropriate for your vehicle and trip. Do not assume every alternative is suitable for every vehicle.
Apply those checks to both options. A route that avoids one construction site may pass through another active work zone, encounter a closure, or add turns and merges that make it difficult to follow. Likewise, the route with the shortest listed delay is not automatically the best choice if the information is uncertain or the roads and weather make it a poor fit. Use the current agency information to rule out routes that are closed or affected by an official detour, then weigh the practical differences among the remaining choices.
If the available information does not establish that an alternate is open and practical, do not treat it as a confirmed safe route. Allow extra time, check for official detour instructions, and be prepared to follow the signs encountered on the road.
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Use this planning sequence
- Check before choosing a route. Open the relevant DOT or local traveler-information service, or call 511 where available. Search your planned route and likely alternate corridors for planned and active work, closures, incidents, weather and delay information.
- Choose a workable alternative if one exists. Compare the reported conditions, timing, complexity and vehicle suitability of the routes. Do not assume the shortest route or a single general-purpose map’s suggestion is the safest option.
- Recheck close to departure. Work schedules, restrictions and traffic conditions can change. Traveler-information systems depend on updates supplied by transportation agencies; federal guidance does not promise that every platform receives every update immediately. FHWA describes real-time work-zone information strategies and their dependence on agency updates in its work-zone transportation management guidance.
- Set up your route before moving. Review the route and any official detour while parked somewhere legal and safe. If a change becomes necessary while driving, stop safely before consulting a device or choosing a new route.
- Follow current instructions on the road. Use the posted signs and official detour directions. Do not make an abrupt lane change or turn because a navigation prompt arrives late or conflicts with the signs.
For a simple final check, ask: Is the route open according to current official information? Is the alternate itself affected by work, weather or a reported delay? Can you follow it without a hurried series of turns? Is it suitable for your vehicle? If you cannot answer those questions confidently, take time to check another official update or allow more time rather than improvising once traffic is moving.
If you have to drive through the work zone
Rerouting is not always practical. When your route enters a work zone, treat the signs and conditions actually present as your immediate guide. FHWA’s 2025 notice tells drivers to “Follow detours and pay attention to signs displaying active work zones.” It also recommends putting down the phone and focusing on driving safely. Read the full USDOT/FHWA safety notice.
- Obey the posted work-zone speed limit and follow temporary signs and detour directions.
- Keep your phone out of your hands; do not search for a new route while moving.
- Stay alert to changing traffic patterns, workers, pedestrians and bicyclists.
- Leave enough space to react to slowing or stopped traffic, especially where lanes narrow or merge.
- Do not follow an unexpected navigation instruction if doing so would conflict with signs or require a sudden maneuver. Continue safely and reassess only when stopped in a legal, safe place.
Work zones can change how traffic moves, and a route that was open on an earlier check may not match conditions when you arrive. Signs and official on-road instructions should guide your actions there; do not treat an earlier app display as overriding them. FHWA’s work-zone materials address temporary traffic control, including its Work Zone program resources.
The federal advice is deliberately practical: avoid the work zone when another route is possible, but if you must pass through, follow the signs and stay attentive. A route plan cannot eliminate changing traffic conditions. Leave enough room to respond to vehicles slowing or stopping, and avoid looking down at a device to resolve a route question in moving traffic. If a prompt seems wrong or arrives too late, continue safely rather than making a sudden maneuver.
What the national safety figures do—and do not—tell you
National figures explain why caution matters, but they cannot identify the safest route for a particular trip. In an April 22, 2025 notice, USDOT and FHWA reported federal work-zone crash figures, including the following:
| Measure | Reported figure | Year and context |
|---|---|---|
| People killed in work-zone crashes | 899 | 2023, based on federal work-zone data reported in the 2025 notice. |
| Fatal work-zone crashes involving speed as a factor | 34% | 2022; the notice identified this as the most current year then available for crash-factor figures. |
| Fatal work-zone crashes involving rear-end collisions | 21% | 2022; the notice identified this as the most current year then available for crash-factor figures. |
| Fatal work-zone crashes involving commercial motor vehicles, including large trucks and buses | 30% | 2022; the notice identified this as the most current year then available for crash-factor figures. |
| Change in work-zone fatalities | Nearly 7% decrease | From 2021 to 2023, based on National Highway Traffic Safety Administration data as reported by FHWA/USDOT in 2025. |
These are lagged national statistics, not estimates of current danger on a specific road, and they do not show whether one of your candidate routes is safer than another. The 2022 crash-factor figures also should not be presented as if they describe 2023 or current local conditions. Their practical value is to reinforce the importance of speed control, attention and space for responding to traffic—not to substitute for route-specific information.
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The figures also should not be read as a prediction about what will happen on a particular trip. The 899 deaths refer to work-zone crashes across the country in 2023; the percentages for speed, rear-end crashes and commercial motor vehicles refer to fatal work-zone crashes in 2022. The different data years matter. For an actual departure decision, current closure, delay, weather and detour information is more relevant than applying a national percentage to one road.
How much can real-time information help?
FHWA’s 2021 technology supplement reported that 98% of the DOT maintenance agencies studied provided some form of real-time information. In surveys reported in that supplement, 40% of surveyed drivers said real-time information was the most highly sought-after type they used for trip decisions, especially for lane closures. The same supplement reported that surveyed drivers favored apps and roadside signs over advisory radio and 511 phone systems.
Those percentages describe named studies and surveys reported in a 2021 technical publication; they are not a measure of every agency’s current service or of present-day preferences everywhere. They support checking available live information, but they do not establish that any one channel is complete or updated instantly. See FHWA’s 2021 work-zone intelligent transportation systems technology supplement for that context.
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When sources or directions disagree
If a navigation prompt conflicts with a posted sign or an official detour, follow the instructions present on the road. Do not swerve, turn abruptly or cross lanes to match a late prompt. If you need to investigate a discrepancy or select another route, pull over only where it is legal and safe to do so.
Before departure, prefer current agency information for closures and detours over an unverified route display. If the agency’s information is unclear or no suitable alternate is confirmed, plan extra time and proceed cautiously rather than assuming the work zone has disappeared. The federal information systems described by FHWA rely on agency-provided data, so availability and update timing can vary.
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A planned closure notice and a live navigation route may also reflect different update times. Do not try to resolve that difference while driving: avoid abrupt changes, follow the on-road signs and instructions, and wait until you are stopped in a legal, safe place to review the route. If you can check before setting off, compare the agency’s current notice with the route you intend to take and identify a practical alternative in advance.
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Transportation agencies use multiple public-information channels to communicate about work zones; the mix can include traveler-information services and roadside signs. FHWA discusses those approaches in its work-zone public information and outreach guidance. The amount of detail available to a traveler depends on the location and the agency’s information, so absence of an online alert is not a reason to ignore signs or conditions on the road.
FHWA’s Work Zone Safety and Mobility Rule information describes federal policy and its scope for agencies; it does not provide individualized route advice or guarantee a particular service’s coverage. For practical trip planning, the relevant state or local road authority remains the source to check for local restrictions, and the active signs remain the instructions to follow while driving. Additional agency-oriented safety guidance is available in FHWA’s work-zone safety countermeasures guide.
That distinction is useful when evaluating a route: federal policy and technical resources describe how agencies manage and communicate about work zones, while the local road authority provides trip-relevant information. A national resource cannot tell you whether a specific lane is open at the hour you will arrive. Check the agency responsible for that road, use 511 where it is available, and let the signs and current conditions guide your decisions in the work zone.
Frequently Asked Questions
What is the best way to find road construction before a trip?
Check the official state DOT or local road authority traveler-information site, or call 511 where available. Look for planned and active work, closures, detours, incidents, weather and reported delays on both your intended route and likely alternatives. Coverage and features vary by location.
Does 511 cover every road and construction update?
No single coverage promise applies everywhere. 511 is a nationally designated traveler-information number, but state and local agencies largely determine how it is implemented and what information it provides. For trips across jurisdiction boundaries, check each relevant agency and recheck close to departure.
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Can I rely on a navigation app to avoid every work zone?
Do not assume any particular commercial app has complete work-zone information. It can help with planning, but compare its route with current official agency information. Follow posted signs and official detours if they differ from an earlier route display.
What should I do if there is no suitable alternate route?
The FHWA recommendation is to find another route where possible; an alternative may not exist or may not suit your vehicle or trip. If you must travel through the work zone, allow time, follow posted detours and speed limits, keep your phone out of your hands, leave room to react and watch for workers and other road users.
When should I check construction and detour information?
Check before choosing your route and again close to departure because work schedules, restrictions and traffic conditions can change. Agency information systems depend on updates supplied by transportation agencies, and every platform is not guaranteed to receive every update immediately.
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What if a route instruction on my phone conflicts with a work-zone sign?
Follow the current signs and official on-road instructions. Do not make a sudden lane change or turn to obey a late prompt. Continue safely, then stop somewhere legal and safe before checking your device or selecting a new route.
Do national work-zone crash statistics show which route is safest for my trip?
No. USDOT and FHWA reported 899 people killed in work-zone crashes in 2023, while their 2025 notice gave crash-factor figures for 2022: speed was a factor in 34% of fatal work-zone crashes, rear-end collisions in 21%, and commercial motor vehicles in 30%. These lagged national figures do not estimate current local risk or compare candidate routes.
The Bottom Line
Check the relevant state or local DOT information before leaving, compare current closures and detours on practical alternate routes, and recheck near departure. Avoid the work zone when a suitable alternative exists; if you must pass through, follow current signs, obey the posted speed and stay focused on the road.
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