Table of Contents
At What Speed Do Airbags Deploy in an Accident?
Key Takeaways
- There is no single airbag deployment speed. Frontal airbags generally deploy based on crash severity rather than the number shown on the speedometer.
- NHTSA uses an 8-to-14-mph fixed-barrier crash as a general benchmark for moderate-to-severe frontal crashes that may trigger frontal airbags.
- Side airbags can deploy at different thresholds. Some may deploy in impacts as low as about 8 mph because there is much less space between the occupant and the point of impact.
- An airbag that does not deploy does not automatically mean the crash was minor or the airbag was defective.
Airbags do not deploy at one fixed vehicle speed. Frontal airbags are generally designed to deploy in moderate-to-severe frontal or near-frontal crashes, which the National Highway Traffic Safety Administration describes as roughly equivalent to hitting a solid, fixed barrier at 8 to 14 mph or higher. That can be comparable to striking a similar-sized parked vehicle at about 16 to 28 mph or higher.
The airbag itself then inflates extremely quickly, typically in less than 1/20th of a second.
That does not mean an airbag must deploy whenever a vehicle is traveling faster than 14 mph. The direction of the crash, how quickly the vehicle slows down, the object struck, seat-belt use, the vehicle's airbag system, and other factors all affect whether deployment occurs.
If you were injured in a Chicago crash and have questions about whether the airbags deployed properly, Conboy Law can review the accident, vehicle evidence, and available insurance coverage. Call 312-726-9000 for a free consultation.
At What Vehicle Speed Do Front Airbags Deploy?
There is no universal speed at which every front airbag must deploy.
According to NHTSA, frontal airbags are generally designed to deploy in moderate-to-severe frontal or near-frontal crashes. As a general comparison, that means a crash equivalent to hitting a solid fixed barrier at approximately 8 to 14 mph or higher.
The Insurance Institute for Highway Safety provides additional context. It says frontal airbags typically deploy for an unbelted occupant in a crash equivalent to striking a rigid wall at approximately 10 to 12 mph. For a belted occupant, the threshold is often closer to 16 mph, because the seat belt may provide sufficient protection in less severe crashes.
These figures are useful benchmarks, not guarantees.
A vehicle traveling 30 mph immediately before a collision does not necessarily experience the same crash forces as a vehicle striking a concrete wall at 30 mph.
Why Isn't There One Airbag Deployment Speed?
Airbags respond to the severity and characteristics of the crash, not simply how fast the vehicle was traveling before impact.
Modern airbag systems use sensors and an electronic control unit to evaluate what is happening during a collision. NHTSA identifies factors such as:
- Vehicle speed
- Crash direction
- Other vehicles or objects involved
- Airbag system design
- Sensor locations
- Occupant characteristics
- Seat-belt use
as factors that can affect deployment.
The important issue is how quickly the vehicle changes speed and the type of forces the sensors detect.
A 25 MPH Crash Does Not Always Trigger an Airbag
Imagine one vehicle traveling 25 mph strikes another vehicle moving in the same direction. Both vehicles may move after impact, allowing some of the crash energy to be absorbed through movement and vehicle deformation.
Now compare that with a vehicle striking a rigid concrete barrier at a lower speed. The vehicle may stop much more abruptly. The second crash can produce the type of rapid deceleration that an airbag system is designed to detect even though the speedometer showed a lower number.
That is why accident speed alone does not tell you whether an airbag should have deployed.
How Fast Does an Airbag Inflate?
This is different from asking how fast the car must be traveling.
Once the airbag system decides deployment is necessary, inflation happens extremely quickly.
NHTSA states that an airbag can inflate in less than 1/20th of a second. Side airbags can inflate even faster because occupants have much less space between themselves and the door, another vehicle, a pole, or another object during a side impact.
The bag must be in position before the occupant's body moves far enough forward or sideways to strike the vehicle interior. This rapid deployment is also why airbags can sometimes cause injuries themselves.
At What Speed Do Side Airbags Deploy?
Side airbags operate differently from frontal airbags. There may be only a few inches between an occupant and the object striking the side of the vehicle. Because of that limited space, side airbags have to respond particularly quickly.
IIHS reports that side-airbag deployment thresholds may be as low as approximately:
- 8 mph in certain narrow-object crashes, such as impacts involving trees or poles
- 18 mph in some broader side impacts, such as vehicle-to-vehicle crashes
Again, those numbers are not universal activation rules. Airbag design varies between vehicles. Curtain airbags may also deploy during certain rollover events or crashes with substantial sideways movement.
Why Didn't My Airbags Deploy in a Crash?
An airbag that stays inside the steering wheel, dashboard, or seat does not automatically mean something went wrong. NHTSA specifically explains that airbags are not intended to deploy in every collision.
Possible reasons include the following.
The Crash Was Below the Deployment Threshold
A low-speed collision may not produce enough rapid deceleration to trigger the system. The seat belt and vehicle structure may be expected to provide adequate protection without deploying a frontal airbag.
The Impact Was in the Wrong Direction
Frontal airbags primarily protect occupants during frontal and near-frontal crashes. A rear impact may cause substantial vehicle damage without creating the type of frontal forces that trigger the front airbags.
Likewise, different side and curtain airbags respond to different crash directions.
The Vehicle Absorbed the Impact Differently
Vehicle structure matters.
Crumple zones are designed to absorb crash energy. Two collisions that occur at the same apparent speed can produce very different sensor readings depending on what was struck, the angle of impact, and how the vehicles moved after contact.
The Passenger Airbag Was Suppressed
Advanced airbag systems may turn off a passenger airbag when sensors detect:
- No passenger
- A small occupant
- A child
- Certain child-restraint situations
NHTSA explains that advanced systems can suppress frontal or side passenger airbags under certain conditions.
There Could Be a Problem With the Airbag System
Sometimes nondeployment does warrant further investigation.
Possible issues may include:
- Defective sensors
- Electrical problems
- Defective airbag components
- Improper repairs following an earlier collision
- An airbag that was previously deployed but never properly replaced
- A recalled or counterfeit replacement component
NHTSA recommends reporting an airbag that fails to deploy in an injury-producing crash when a possible defect is suspected.
Does Airbag Nondeployment Mean the Accident Was Minor?
No.
An insurer should not automatically conclude that a person could not have been seriously injured simply because the airbags did not deploy. Deployment depends on several variables, including crash direction, deceleration, vehicle design, sensor strategy, occupant position, and seat-belt status.
For example, a rear-end collision can cause serious occupant movement while never creating the type of frontal impact that calls for deployment of the steering-wheel or dashboard airbags.
Likewise, an angled collision may damage a vehicle severely without triggering every restraint system. Airbag deployment is one piece of crash evidence. It is not a complete measurement of injury severity.
Justice feels closer when the right lawyers are on your side.
What Information Can the Vehicle Record About Airbag Deployment?
Many vehicles contain an event data recorder, often informally called a vehicle's “black box.”
NHTSA explains that an EDR may record technical information for a short period before, during, and after a crash, including data relating to:
- Pre-crash vehicle dynamics
- Driver inputs
- Vehicle crash forces
- Seat-belt use
- Airbag or restraint-system deployment
- Vehicle speed in some systems
Not every vehicle records the exact same information, and EDR evidence has limitations. NHTSA recommends evaluating it together with other crash evidence rather than relying on it alone.
In a serious accident, this information may help investigators understand how the crash occurred and how the vehicle's safety systems responded.
Can Airbag Deployment Cause Injuries?
Yes. Airbags are designed to reduce the risk of serious head and chest injuries, but they deploy with substantial force and can also cause injuries.
Possible injuries associated with airbag deployment may include:
- Facial bruising
- Cuts and abrasions
- Chest injuries
- Hand or arm injuries
- Eye injuries
- Hearing problems
- Burns or skin irritation
The risk can be greater when someone is sitting too close to the steering wheel or dashboard.
NHTSA recommends using seat belts and maintaining as much practical distance as possible from frontal airbags. Airbags are supplemental restraints, they are designed to work with seat belts, not replace them.
What If an Airbag Failed to Deploy and You Were Injured?
A failure to deploy does not automatically prove that the vehicle or airbag was defective. However, an unexpected nondeployment in a serious injury-producing crash may justify a closer investigation.
Important evidence can include:
- The damaged vehicle
- Airbag control modules
- Event data recorder information
- Crash photographs
- Police reports
- Vehicle repair history
- Airbag warning-light records
- Recall information
- Previous collision records
- The vehicle's original and replacement airbag components
Preserving the vehicle can be particularly important if there is a question about whether the restraint system operated properly.
Repairing, dismantling, selling, or disposing of the vehicle too early can make it harder for engineers and other experts to inspect the system later.
Can Airbag Evidence Matter in a Chicago Car Accident Claim?
Yes. Airbag evidence may become important when the parties disagree about how severe the collision was, how the vehicles moved, or what happened inside the vehicle.
For example, investigators may compare:
- Vehicle damage
- Airbag deployment
- EDR information
- Seat-belt evidence
- Police measurements
- Photographs
- Medical records
- Witness statements
An insurer may try to point to nondeployment as evidence that the collision was not serious. That conclusion does not necessarily follow. The more useful question is why the airbags did or did not deploy given the specific crash dynamics.
What Should You Do After a Crash Where the Airbags Deployed?
If you have been in a collision involving airbag deployment:
- Get medical attention: Some injuries are not immediately obvious.
- Photograph the vehicle interior: Document deployed airbags, seat belts, steering wheel, dashboard, doors, and visible injuries.
- Preserve the vehicle when possible: This is particularly important if a safety-system defect may be involved.
- Keep your medical records and bills: Save documentation related to treatment, prescriptions, and other accident-related expenses.
- Save the police crash report and insurance correspondence: These records may become important when investigating the collision or handling an insurance claim.
- Do not assume deployment or nondeployment proves how serious the crash was: Airbag deployment depends on crash forces, direction, vehicle design, and other factors.
- Consider having the vehicle evidence reviewed before major repairs or disposal: This can be especially important if the airbag system or another safety feature may be disputed.
Frequently Asked Questions (FAQs)
There is no single speed. NHTSA says frontal airbags are generally designed for moderate-to-severe crashes equivalent to striking a fixed barrier at roughly 8 to 14 mph or higher.
They can, depending on the impact. A rigid frontal impact around that range may trigger some frontal airbags, while another 10 mph crash may not produce sufficient deceleration.
Possibly. A 20 mph crash can be severe enough to trigger airbags, but speed alone does not determine deployment. Crash direction, deceleration, vehicle design, seat-belt status, and the object struck all matter.
Yes. Airbag deployment and whether an insurer considers a vehicle a total loss involve different questions. An airbag may deploy even if the vehicle is repairable.
Visible vehicle damage does not necessarily correspond to airbag deployment criteria. The direction and severity of the forces detected by the airbag system matter more than the appearance of the damage alone.
Talk to Conboy Law After a Chicago Car Accident
There is no single speed that automatically makes an airbag deploy. Frontal airbags generally respond to moderate-to-severe frontal crashes, while side and curtain systems have their own deployment strategies. Whether a particular airbag should have deployed requires looking at much more than the speedometer.
If you were injured in a Chicago car accident, Conboy Law can investigate the collision, available vehicle evidence, insurance coverage, and the losses you suffered. If questions exist about airbag deployment or another vehicle safety system, preserving the evidence early may be especially important.
Call Conboy Law at 312-726-9000 for a free consultation after a Chicago car accident.
Joseph M. Conboy is the founding attorney of Conboy Law and represents victims and families in serious personal injury, medical malpractice, and wrongful death cases throughout Illinois. He has obtained numerous multi-million-dollar results and has been recognized by Super Lawyers as a Rising Star. As the firm’s primary litigator, he works closely with clients to build strategies tailored to the facts of each case.
