Every "Acceptable" AEB System Failed to Stop for a Motorcycle at 43 MPH
IIHS updated its front crash prevention evaluation in 2026 to include motorcycle targets alongside passenger car and semitrailer targets. The test runs at 31, 37, and 43 mph.
In the 43 mph test with a motorcycle target, every single vehicle rated "acceptable" failed to prevent a collision with the motorcycle. Systems issued warnings. None stopped the vehicle.
What AEB Is Supposed to Do
Automatic Emergency Braking (AEB) is marketed as a collision prevention technology. The system uses radar, lidar, or cameras to detect objects in the vehicle's path. When a collision is imminent and the driver hasn't reacted, the system applies the brakes automatically.
It works. For cars.
IIHS found that current AEB systems are less effective at preventing crashes with motorcycles and medium or heavy trucks than they are at preventing crashes with other passenger vehicles. The 43 mph motorcycle test quantified that gap: 100% failure rate among vehicles rated acceptable for front crash prevention when the target was a motorcycle.
Why the Systems Fail
Motorcycles have a smaller radar and lidar cross-section than cars. The sensors see them late, or they don't see them at all. This isn't a calibration issue. It's a detection gap built into how the system perceives objects.
AEB systems are optimized for what they're tested on: passenger vehicles. NHTSA doesn't require motorcycle detection as part of AEB certification. Manufacturers built systems that pass the tests they're given. The result is technology marketed as "collision prevention" that demonstrably fails to detect one of the most vulnerable road users.
The Scale of the Problem
In 46 percent of fatal two-vehicle crashes involving a motorcycle and another type of vehicle in 2023, the other vehicles were turning left while the motorcycles were going straight, passing, or overtaking other vehicles (NHTSA, 2025, https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/813732). That crossing-path scenario is exactly what AEB is meant to address.
Per 100 million vehicle miles traveled in 2023, the fatality rate for motorcyclists was almost 28 times the passenger car occupant fatality rate (NHTSA, 2025, https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/813732). Technology that claims to prevent crashes but can't see motorcycles doesn't close that gap. It widens the false confidence on both sides: drivers trust the system to stop, and it doesn't. Riders assume a car with AEB will detect them, and it won't.
What IIHS Testing Means
IIHS adding motorcycle targets to the evaluation is the first step. It makes the failure visible. More than 77% of 2026 models meet acceptable or good standards for the new crash prevention evaluation overall, and 63 vehicles qualify for IIHS awards so far in 2026, up from 48 at the same point in 2025.
But none of those "acceptable" or better ratings stopped for the motorcycle at 43 mph.
The second step is NHTSA rulemaking requiring motorcycle detection as part of AEB system certification. Until that happens, every vehicle with a "collision prevention" badge carries an asterisk: *unless the other vehicle is a motorcycle.
The Accountability Question
Who answers for this?
Manufacturers designed systems to pass the certification they're required to meet. NHTSA hasn't required motorcycle detection. IIHS filled the testing gap voluntarily, but they're not a regulator.
The technology exists. ECE R131, the European standard for AEB, includes requirements for detecting vulnerable road users, including motorcyclists. Manufacturers selling in both markets have access to the capability. They don't deploy it here because they're not required to.
A safety feature that works for cars but not motorcycles isn't a technical limitation. It's a regulatory choice. NHTSA sets the standard. Manufacturers build to it. Riders die in crashes the technology could have prevented, if anyone had required it to see them.
That's not an accident. That's policy.
What Riders Can Do (Which Isn't Much)
You can't rely on AEB to save you. Ride like every car can't see you, because functionally, their safety systems can't.
You can buy an ECE 22.06 helmet, which includes rotational impact testing (UNECE, 2021, https://unece.org/transport/documents/2021/08/standards/un-regulation-no-22-rev5-06-series) that DOT FMVSS 218 doesn't require. You can take an MSF advanced course. You can wear high-visibility gear. You can avoid the hours with the highest crash rates (Friday and Saturday nights, 6 PM to 3 AM, per NHTSA crash data). You can assume every left-turning vehicle will turn into you.
None of that makes AEB work. It just keeps you alive in spite of the systems that are supposed to prevent the crash in the first place.
The Europeans required motorcycle detection in AEB. We didn't. That's the policy choice. Riders are absorbing the cost of it, one crossing-path collision at a time.
