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Illustration: Lazaro Gamio / Axios

The biggest difficulty in self-driving cars is not batteries, fearful drivers, or expensive sensors, but what's known as the "trolley problem," a debate over who is to die and who saved should an autonomously driven vehicle end up with such a horrible choice on the road. And short of that, how will robotic vehicles navigate the countless other ethical decisions, small and large, executed by drivers as a matter of course?

In a paper, researchers at Carnegie Mellon and MIT propose a model that uses artificial intelligence and crowd sourcing to automate ethical decisions in self-driving cars. "In an emergency, how do you prioritize?" Ariel Procaccia, a professor at Carnegie Mellon, tells Axios.

The bottom line: The CMU-MIT model is only a prototype at this stage. But it or something like it will have to be mastered if fully autonomous cars are to become a reality.

"We are not saying that the system is ready for deployment. But it is a proof of concept, showing that democracy can help address the grand challenge of ethical decision making in AI," Procaccia said.

How they created the system: Procaccia's team used a model at MIT called the Moral Machine, in which 1.3m people gave their ethical vote to around 13 difficult, either-or choices in trolley-like driving scenarios. In all, participants provided 18.2 million answers. The researchers used artificial intelligence to teach their system the preferences of each voter, then aggregated them, creating a "distribution of societal preferences," in effect the rules of ethnical behavior in a car. The researchers could now ask the system any driving question that came to mind; it was as though they were asking the original 1.3 million participants to vote again.

A robot election: "When the system encounters a dilemma, it essentially holds an election, by deducing the votes of the 1.3 million voters, and applying a voting rule," Procaccia said. He said, "This allows us to give the following strong guarantee: the decision the system takes is likely to be the same as if we could go to each of the 1.3 million voters, ask for their opinions, and then aggregate their opinions into a choice that satisfies mathematical notions of social justice."

Go deeper

23 mins ago - World

Barbados becomes a republic, replacing U.K. queen with president

Combination images of Dame Sandra Mason, president of Barbados, and Britain's Prince Charles at her swearing-in ceremony in Bridgetown, Barbados, late Monday.

Barbados officially became a republic at midnight local time after Dame Sandra Mason was sworn in as the Caribbean nation's first president in a ceremony attended by the United Kingdom's Prince Charles.

Why it matters: Mason replaced Britain's Queen Elizabeth as head of state Tuesday — removing the country's final remaining colonial tie to the U.K. almost 400 years after the first British ships arrived in Barbados.

Right-wingers making McCarthy sweat for future Speaker post

House Minority Leader Kevin McCarthy stands with his Republican colleagues outside the House on Nov. 17. Photo: Stefani Reynolds/Bloomberg via Getty Images

Right-wing elements in the Republican Party are complicating House Minority Leader Kevin McCarthy's attempts to become the next speaker of the House should the GOP take back the majority in 2022.

Why it matters: While McCarthy has worked carefully to build trust among the conservatives who tanked his chances at clinching the speakership in 2015, they're still circling ahead of the next Speaker vote in January 2023.

4 hours ago - Politics & Policy

Congress sprints to meet crush of deadlines

Illustration: Aïda Amer/Axios

Congressional leaders have been pushing off vital action for months — and a lot of it will catch up with them in December, which begins Wednesday.

Driving the news: Funding for the federal government is set to expire at midnight on Friday. There are also consequential deadlines related to the debt limit, President Biden's agenda and annual actions like voting on the National Defense Authorization Act.

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