Photo: Volvo Cars

The expected benefits of self-driving cars are widely touted: They will be safer than human drivers and improve access to transportation for people with disabilities, the elderly and the poor.

One other potential benefit: They will be better for the environment (and not just because most AVs will be electric).

Driving the news: A new study by the National Renewable Energy Laboratory on behalf of Volvo showed a 5% to 7% drop in fuel consumption for cars driving with adaptive cruise control compared with human drivers.

  • NREL studied Volvos driven by employees and their families near the company's headquarters in Gothenburg, Sweden.
  • They compared the fuel economy of cars using adaptive cruise control to those without the system, which automatically adjusts to the speed of the car ahead.
  • It's the first study that uses real-world driving data to show how much more efficient cars with driver-assistance features can be, according to Green Car Reports.

Quick take: With less stop-and-go driving, cars drive at a steadier pace and thus burn less fuel.

What to watch: Future developments such as platooning and vehicle-to-vehicle communications could smooth traffic flow even further, making cars potentially even more efficient.

Go deeper

Death spiral for consumers

Illustration: Eniola Odetunde/Axios

Despite some recent good news about dwindling household debt, the financial health of U.S. consumers is rapidly deteriorating — and families with children are faring the worst.

Why it matters: As Congress deadlocks over pandemic relief and President Trump issues executive orders of dubious potency, many Americans are suffering from a quintuple whammy: unemployment, overdue rent, mounting bills, food insecurity and health fears.

The end of Hong Kong's political freedom is here

Illustration: Annelise Capossela/Axios

The end of Hong Kong's relatively free political system is no longer looming. It's here.

Why it matters: The Chinese Communist Party is already wielding the new national security law it forced upon Hong Kong just over a month ago.

  • And through the extraterritoriality enshrined in the new law, Beijing has signaled that its push against pro-democracy activism is going global.

First look: New Trump ad doubles down on radical left frame for Biden

Combination images of President Trump and Joe Biden. Photo: Scott Olson/Getty Images/Mark Makela/Getty Images

The Trump campaign launches a new ad Tuesday in five early-voting states that hits Joe Biden on taxes and immigration, redoubling a strategy to paint the Democratic nominee as a tool of the radical left.

Driving the news: "In His Own Words" will be a "high seven figure" spend running in Florida, Arizona, North Carolina, Georgia and Wisconsin, a senior campaign official tells Axios.