In the next great auto-safety advance, 20 automakers have agreed to make automatic emergency braking a standard feature on cars and trucks starting in September, 2022, it was announced Thursday.

“By proactively making emergency braking systems standard equipment on their vehicles, these 20 automakers will help prevent thousands of crashes and save lives,” said U.S. Transportation Secretary Anthony Foxx. “It’s a win for safety and a win for consumers.”

The feature has already shown up in many models today, usually as an option. If the car detects it about a rear-end the car in front of it, it slams on the brakes — either entirely preventing the accident or vastly decreasing the amount of force of impact.

Automatic emergency braking joins a long list of safety technologies that gradually became mandated as standard equipment, from seat belts and air bags to more recently, backup cameras. The systems use a combination of radar, cameras and lasers to determine distance and relative velocity of vehicles in front. The same combination of sensors are also used in the emerging self-driving car technologies.

The 20 automakers include 99% of the new-car market, says the National Highway Traffic Safety Administration, which is part of the Transportation Department. The agency, along with the insurance industry’s safety arm, the Insurance Institute for Highway Safety, negotiated the deal. IIHS says it expects the deal will shave three years off the time it would have taken for a new rule to be implimented without the deal.

During those three years, IIHS estimates believes the deal will prevent 28,000 crashes and 12,000 injuries.

Automakers joining in the deal include Audi, BMW, Fiat Chrysler, Ford, General Motors, Honda, Hyundai, Jaguar Land Rover, Kia, Maserati, Mazda, Mercedes-Benz, Mitsubishi, Nissan, Porsche, Subaru, Tesla, Toyota, Volkswagen and Volvo. It will also be standard on most medim-duty trucks by Sepember, 2025.

“Deploying AEB on a wide scale will allow us to further evaluate the technology’s effectiveness and its impact on insurance losses, so that more insurers can explore offering discounts or lower premiums to consumers who choose AEB-equipped vehicles,” says IIHS Board Chairman Jack Salzwedel, who is also CEO of American Family Insurance.