A smarter seat belt is coming to U.S. roads ― and its inventors claim the technology can save more lives and prevent injuries once thought unavoidable from car accidents.
The belts debuted in the United States through the launch of the new Volvo EX60 midsize electric SUV earlier this year with a starting price of $59,795. Though it does not break out sales by model, Volvo Cars sold 23,766 vehicles in third quarter 2026, of which 1,787 were electric.
Volvo Cars last year said it developed the world’s first multi-adaptive safety belt that can adapt to traffic conditions and the person wearing it using real-time data from the car’s sensors. That updated data directly from the occupant teaches the belt about who is driving to offer them protection
more proportionate to their size and weight.
According to the company, the belt adjusts to best accommodate the size of its drivers and passengers and velocity at which they would travel in cars moving at different speeds during the crash.
Larger occupants in a serious crash, for example, receive a higher belt load setting to protect their heads, while smaller occupants in a milder crash require a lower belt load setting to reduce the risk of rib fractures.
Restraints that match your body
Customized occupant protection based on real-time adapting restraints sets a new era in crash safety, according to Lotta Jakobsson, senior technical leader of safety at Volvo Car Corporation.
Jakobsson told the Detroit Free Press that experts in automotive safety have known about the discrepancies between different body types in the event of a crash for some time but that technology advancements in the past few years have allowed them to make meaningful changes to close some of those gaps.
Volvo’s seat belt breakthrough didn’t come from the use of artificial intelligence, but the worldwide investment in improving machine learning has developed the computing power required to process data quicker.
Progress in advanced driver assist systems ― the building blocks of autonomous driving that include adaptive cruise control and lane keeping ― also meant larger and more powerful computers inside the vehicle. Those same computers Volvo uses to improve the efficacy of its restraint systems, Jakobsson said.
Evolution of seat belts
The journey to the modern vehicle safety belt began when the lap belt, its use was largely voluntary, first became an optional feature in vehicles in the late 1950s.
Like in the United States, most of the vehicle safety infrastructure in Sweden started around that time. Researchers used information from real car accidents for guidance on what to improve.
Volvo design engineer Nils Bohlin patented the three-point system, involving a lap strap and shoulder strap, in 1958. Belts became mandated in the United States a decade later, in 1968, even in the back seats. The modern integrated three-point lap and shoulder seat belts Bohlin designed became standard in United States vehicles in 1973.
Other innovations aiming to improve usage, including automatic belts in the 1980s, came into popularity.
The Centers for Disease Control and Prevention estimates that seat belts saved 14,955 passenger vehicle occupants in 2017 alone and an additional 2,549 lives could have been saved that year if every occupant involved in a crash had 100% seat belt use.
How modern belts work
Most modern seat belts rely on traditional load limiters with up to three profiles, Jakobsson notes, to control the stretch of the belt during a crash. Depending on the force expected to affect the occupant, the safety system is preprogrammed to one of those three settings.
Volvo’s new, multistage load limiter expands to 11 load-limiting profiles that substantially increase tailoring possibilities. Restraint settings can be set according to the situation, which Jakobsson defines as the combination of the severity of the crash, the type of occupant and their seat adjustment.
Alongside sensor development, the onboard computing power can process the crash type, such as at what speed, and what type of impact occurs ― vehicle to vehicle, or a stationary object like the side of a building.
With the real-time data from the car’s sensors, each profile can be further adapted into a range of settings by varying the force of the seat belt’s restraint, and the timing with which the occupant is restrained.
Optimally, Jakobsson said, the occupant moves forward within the belt as long as possible but without striking through and hitting the hard structure in front of them.
Managing that balance of weight and movement to minimize harm is ultimately the job of a safety belt load-limiter.
“We look into the data and try to understand for the situation, ‘Who is the most vulnerable?’ That could be a size, a posture,” she said. “If we address that person or a combination thereof, then we also protect the other ones that are less at risk.”
Jackie Charniga covers General Motors for the Free Press. Reach her at jcharniga@freepress.com.
This article originally appeared on Detroit Free Press: A revolutionary new seat belt? One automaker's design could save lives
