When a bridge or crossing closes, confirm the closure and the signed detour with the road authority responsible for that route before you travel. Then check that the alternate roads are legal and suitable for your vehicle. Navigation apps can lag a changing closure, and a route that works for a car may be unsafe or prohibited for a truck, bus, or oversized load.
1. Confirm the closure and official detour
Check the current traveler-information service for the state DOT or local road agency that manages the crossing, and pay attention to signs at the closure. Treat posted closure and detour controls as authoritative; do not rely on a navigation app as the sole source when conditions are changing.
Information services have defined purposes and coverage. Caltrans, for example, describes QuickMap as a real-time source for state-highway conditions, not a navigation app. Its California Truck Network is the official source for truck routes on California state highways. These are California examples; find the corresponding official sources for your location.
2. Follow the marked route—do not improvise through the closure
Use the signed detour rather than attempting to cross a closed bridge, enter a work area, or find an unmarked shortcut. Detour signs and temporary traffic controls are part of the closure plan. The Federal Highway Administration’s MUTCD 11th Edition, Part 6, includes guidance for “Road Closure with an Off-Site Detour” and says, “Regulatory traffic control devices should be modified as needed for the duration of the detour.” See the MUTCD, Part 6.
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Major emergency detours are generally coordinated by transportation and response agencies. They can involve signs, police, public works, and traffic-signal adjustments; a route that looks straightforward on a map may depend on those controls to operate safely. FHWA describes closure and detour planning in its Field Operations Guide and Emergency Operations Guidebook.
3. Check that the detour fits your vehicle
Before taking an alternate route, check posted and official restrictions for the vehicle you are driving. Bridge closures can force traffic onto roads with different clearance, weight, length, or turning constraints. A route suitable for a passenger car is not automatically suitable for a commercial truck, bus, or permitted load.
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- Height: Check bridge and overhead clearances.
- Weight and axle loads: Verify bridge limits and any applicable road restrictions.
- Length and turning geometry: Confirm the route can accommodate the vehicle and its turns.
- Permits and access rules: For oversize or overweight loads, check applicable restrictions and permit requirements with the responsible authority.
Commercial drivers may use a truck atlas as a secondary planning reference. A U.S. DOT report describes the Rand McNally Motor Carriers’ Road Atlas as including state access policies, legal size and weight limits, low clearances, and restricted routes, but the report references a 2018 edition. Check the edition and current route information; a printed atlas does not provide live closure updates. The report also recommends truck- and bus-oriented navigation, entering vehicle dimensions and axle weights before travel, keeping maps updated, and following road signs and advisories. See U.S. DOT’s traveler-information report for commercial vehicle operations.
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Coverage varies by jurisdiction. Indiana DOT says its bridge-clearance map covers interstates, U.S. highways, and state routes; for city streets or county roads, travelers must obtain municipal approval. That is Indiana-specific guidance, not a nationwide rule. Consult INDOT’s restrictions and closings information and the relevant local authority for routes in Indiana.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.5. Allow for traffic and changing conditions
Recheck official conditions before leaving and allow extra time. Diverted traffic can make alternate roads busier than usual, and those roads may need additional traffic controls too, as FHWA notes in its guidance on traffic control during incident clearance.
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The scale of disruption can vary widely. FHWA reported that the I-10 bridge closure in Los Angeles diverted approximately 290,000 vehicles a day in 2023. That figure describes that specific incident; it is not a typical estimate for other closures. See the FHWA bridge materials memorandum.
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A quick pre-trip check
- Confirm the closure and detour through the responsible road authority’s current information.
- Follow the signs and traffic controls; do not enter the closed crossing or work area.
- Check height, weight, length, turning, and permit restrictions for your vehicle.
- Verify local-road restrictions if the route uses city or county roads.
- Recheck conditions and leave time for added traffic or changes.
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