Hide Under Highway Overpasses (Severe Hail Safety)
Do not stop, park, or leave a vehicle beneath a highway overpass to escape hail. If you can safely reach a substantial enclosed building, go there. If hail catches you while driving, pull over only where you are clear of traffic and other hazards, stay belted inside, close the windows, and move away from the glass.
I plan for hail by looking for a safe destination before the weather becomes urgent. The best low-cost step is to check official forecasts and identify nearby enclosed buildings and safe places to pull off the road. You do not need special gear to make that plan. An overpass may look sturdy, but it is not a designated hail shelter, and stopping beneath it can create serious traffic and safety risks.
Plan a Safe Hail Destination
A hail destination is a substantial enclosed building you can reach without taking an unsafe route. Planning it in advance can reduce rushed decisions when visibility drops or hail begins. Check official weather alerts, know your route, and identify safe places to stop if reaching shelter is no longer practical.
Before a trip, check the National Weather Service (NWS) forecast and alerts for your route. If severe weather is possible, note towns, rest areas, or other locations with substantial enclosed buildings. A building is generally a better shelter choice than a vehicle, but do not make a risky detour or continue driving into dangerous conditions to reach one.
Use free, reliable information where available: official weather alerts, road agency updates, and route maps. A phone can help you check conditions while parked, but do not handle it while driving. If traveling with others, agree in advance on who will monitor alerts and what to do if the route changes.
A practical plan includes more than a destination. Know where you could stop legally and safely if hail starts before you reach a building. A wide, accessible parking area away from moving traffic may be an option when conditions require stopping. A narrow shoulder, bridge deck, tunnel entrance, or underpass is not a safe substitute simply because it is nearby.
The goal is not to predict the exact minute hail will begin. It is to avoid making a shelter decision at the last moment, under pressure. Recheck the forecast if your route or timing changes, and follow instructions from local officials.
Check Vehicle Access and Stopping Clearance
Stopping clearance means having enough room to get completely out of moving traffic without blocking a lane, creating a hazard, or preventing emergency access. If hail catches you while driving, choose a safe, legal stopping place only when one is available. Do not stop beneath an overpass or in a travel lane.
An overpass is part of the roadway, not a public shelter. The Manual on Uniform Traffic Control Devices (MUTCD), 11th Edition, covers traffic-control devices and work zones; it does not turn a shoulder or bridge area into an informal refuge. Road conditions, sight lines, and traffic flow matter, especially when storms reduce visibility.
If there is no safe place to pull off immediately, do not swerve or brake suddenly to reach one. Keep control of the vehicle and continue only as needed to reach a place where you can stop safely. Conditions can vary by road, so use sound judgment and follow directions from emergency or road authorities.
| Situation | Safer response | Avoid |
|---|---|---|
| A substantial enclosed building is reachable by a safe route | Go there before conditions become dangerous | Driving into worsening hail or poor visibility to reach it |
| Hail begins while you are driving and a safe pull-off is available | Pull fully clear of traffic, stop legally, and remain in the vehicle | Stopping on a travel lane or narrow shoulder |
| The nearest apparent shelter is an overpass | Continue to a safer option if conditions allow | Parking or walking beneath the structure |
| You are already stopped in a safe place | Stay inside and follow official alerts | Leaving the vehicle to inspect hail or take photos |
A bridge’s structural design does not establish that the area beneath it is safe for people. AASHTO bridge design specifications address bridge design for transportation uses; they do not certify an ordinary overpass as a hail refuge. Likewise, concrete construction or a presumed load rating says nothing by itself about protection from traffic, debris, wind, or water.
Shelter Without Using the Overpass
Hail shelter means protection from falling ice and the hazards around it, not just a solid roof overhead. The NWS advises seeking substantial shelter and, for motorists caught in hail, staying in the vehicle and keeping occupants away from windows. An ordinary overpass is not a designated shelter, even if it appears strong.
If a substantial building is safely reachable, use it. Once inside, stay away from windows and follow local instructions. Do not cross active traffic or walk through a storm to reach a building. If you are caught in hail while driving and cannot safely reach a building, pull over only in a location clear of traffic and other immediate hazards.
Once stopped safely, remain in the vehicle, keep your seat belt fastened, close the windows, and keep your head and body away from the glass. If you have passengers, tell them to move away from windows as well. These steps reduce exposure to broken glass and hail, but a vehicle is not a guaranteed shelter from every severe-weather hazard.
Do not leave the vehicle to stand beneath an overpass. People on foot are exposed to moving traffic and flying debris, and an underpass can have poor visibility or collect water. Stopping there can also obstruct other drivers or emergency responders. Severe hail and wind can make a location that looks sheltered dangerous in ways that are hard to judge from the road.
ICC 500 is a standard for storm shelters used for defined hazards and applications. It does not certify an ordinary highway overpass as a hail shelter. There is no general refuge specification that makes a bridge’s clearance, airflow, or construction proof of safe public sheltering. Do not infer shelter protection from a structure’s appearance.
Illustrative scenarios, not case reports
The examples below are hypothetical planning scenarios, not reports of specific incidents. They show how the same guidance applies in different situations.
- A driver sees an alert before leaving: I would use the delay to check the route and identify an enclosed destination and safe pull-off options. If conditions are expected to worsen, postponing travel may be safer than relying on a roadside shelter.
- Hail begins on a busy highway: If a safe, legal place to pull off is available, the driver can stop fully clear of traffic and remain inside. A busy overpass does not become a safer choice just because many other drivers have stopped there.
- A traveler is already beneath an overpass: Do not step out into traffic or make a sudden maneuver. Focus on regaining a safe position only when traffic and conditions allow, and follow instructions from police or road crews. Do not assume the spot is protected.
A useful decision rule is to separate “shelter” from “stopping.” A building may be a destination; a safe pull-off may be a temporary place to wait in the vehicle. An overpass is neither a recommended hail destination nor a safe place to gather.
Verify Conditions Before Continuing
Waiting until the hail stops is not always enough to make travel safe. Before moving, check official alerts and look for hazards that may remain, such as poor visibility, standing water, fallen branches, damaged power lines, or debris. Resume only when the route is safe and you can see clearly enough to drive.
Do not step into traffic to inspect damage. If you are in a safe parking area, check your surroundings from the vehicle first. Watch for downed wires and avoid approaching them; report hazards to the appropriate emergency or utility service. If flooding covers the roadway, do not drive through it.
Hail can leave roads slippery or blocked, and another storm cell may still be nearby. Use official weather and road updates rather than assuming the danger has passed because the hail has stopped at your location. Follow instructions from emergency personnel, and do not move a vehicle if doing so would put people at greater risk.
A final check before departure is simple: Can you see the road? Is the route clear? Are official alerts or responders advising you to wait? If any answer raises concern, remain in a safe place and reassess. There is no single fixed waiting time that fits every storm or road.
Frequently Asked Questions
These answers address the immediate choice drivers face when hail threatens near a highway overpass. The key distinction is between a designated enclosed shelter and a safe place to stop in a vehicle. Follow current NWS guidance and instructions from local authorities, since road and weather conditions differ.
Should I hide beneath a highway overpass during hail?
No. Do not stop, park, or leave your vehicle beneath an overpass to avoid hail. It is not a designated hail shelter and may expose you to traffic and other hazards.
What should I do if hail starts while I am driving?
If you can safely reach a substantial enclosed building, go there. Otherwise, pull over only where you are clear of traffic and hazards, then stay belted inside with the windows closed.
Should I get out of my car under an overpass?
No. Leaving the vehicle puts you near moving traffic and may expose you to debris, wind, or water. Remain inside if you have stopped in a safe location.
Is a concrete overpass safer because it is strong?
Not necessarily. Bridge strength for transportation use does not prove that the area beneath it protects people from hail or surrounding hazards.
Can I stop on a highway shoulder during hail?
Only if it is a safe and legal place to stop, and you can get fully clear of traffic. Narrow shoulders, poor visibility, and nearby hazards can make stopping there dangerous.
Should I keep driving to reach a building?
Only if the route remains safe. Do not drive into worsening hail or reduced visibility just to reach shelter; choose a safe stopping place if continuing would be dangerous.
Where should passengers sit in a vehicle during hail?
Keep everyone inside with seat belts fastened, windows closed, and occupants’ heads and bodies away from the glass.
How long should I wait before driving again?
There is no fixed time. Wait until hail and dangerous conditions have passed, visibility is adequate, the route is clear, and official alerts or responders do not indicate that you should remain stopped.
Does ICC 500 certify highway overpasses as hail shelters?
No. ICC 500 covers defined storm-shelter applications; it is not certification that an ordinary overpass protects people from hail.
What hazards should I check before moving?
Look for poor visibility, flooding, branches, debris, and downed wires. Do not approach fallen power lines or drive through water covering the road.
(This article was written by one of our staff writers, Steven Langford. Visit our Meet the Team page.)
