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Stanford studies human impact when self-driving car returns control to driver
Researchers involved with the Stanford University Dynamic Design Lab have completed a study that examines how human drivers respond when an autonomous driving system returns control of a car to them. The Lab’s mission, according to its website, is to “study the design and control of motion, especially as it relates to cars and vehicle safety. Our research blends analytical approaches to vehicle dynamics and control together with experiments in a variety of test vehicles and a healthy appreciation for the talents and demands of human drivers.” The results of the study were published on December 6 in the first edition of the journal Science Robotics.
Holly Russell, lead author of study and former graduate student at the Dynamic Design Lab says, “Many people have been doing research on paying attention and situation awareness. That’s very important. But, in addition, there is this physical change and we need to acknowledge that people’s performance might not be at its peak if they haven’t actively been participating in the driving.”
The report emphasizes that the DDL’s autonomous driving program is its own proprietary system and is not intended to mimic any particular autonomous driving system currently available from any automobile manufacturer, such as Tesla’s Autopilot.
The study found that the period of time known as “the handoff” — when the computer returns control of a car to a human driver — can be an especially risky period, especially if the speed of the vehicle has changed since the last time the person had direct control of the car. The amount of steering input required to accurately control a vehicle varies according to speed. Greater input is needed at slower speeds while less movement of the wheel is required at higher speeds.
People learn over time how to steer accurately at all speeds based on experience. But when some time elapses during which the driver is not directly involved in steering the car, the researchers found that drivers require a brief period of adjustment before they can accurately steer the car again. The greater the speed change while the computer is in control, the more erratic the human drivers were in their steering inputs upon resuming control.
“Even knowing about the change, being able to make a plan and do some explicit motor planning for how to compensate, you still saw a very different steering behavior and compromised performance,” said Lene Harbott, co-author of the research and a research associate in the Revs Program at Stanford.
Handoff From Computer to Human
The testing was done on a closed course. The participants drove for 15 seconds on a course that included a straightaway and a lane change. Then they took their hands off the wheel and the car took over, bringing them back to the start. After familiarizing themselves with the course four times, the researchers altered the steering ratio of the cars at the beginning of the next lap. The changes were designed to mimic the different steering inputs required at different speeds. The drivers then went around the course 10 more times.
Even though they were notified of the changes to the steering ratio, the drivers’ steering maneuvers differed significantly from their paths previous to the modifications during those ten laps. At the end, the steering ratios were returned to the original settings and the drivers drove 6 more laps around the course. Again the researchers found the drivers needed a period of adjustment to accurately steer the cars.
The DDL experiment is very similar to a classic neuroscience experiment that assesses motor adaptation. In one version, participants use a hand control to move a cursor on a screen to specific points. The way the cursor moves in response to their control is adjusted during the experiment and they, in turn, change their movements to make the cursor go where they want it to go.
Just as in the driving test, people who take part in the experiment have to adjust to changes in how the controller moves the cursor. They also must adjust a second time if the original response relationship is restored. People can performed this experiment themselves by adjusting the speed of the cursor on their personal computers.
“Even though there are really substantial differences between these classic experiments and the car trials, you can see this basic phenomena of adaptation and then after-effect of adaptation,” says IIana Nisky, another co-author of the study and a senior lecturer at Ben-Gurion University in Israel “What we learn in the laboratory studies of adaptation in neuroscience actually extends to real life.”
In neuroscience this is explained as a difference between explicit and implicit learning, Nisky explains. Even when a person is aware of a change, their implicit motor control is unaware of what that change means and can only figure out how to react through experience.
Federal and state regulators are currently working on guidelines that will apply to Level 5 autonomous cars. What the Stanford research shows is that until full autonomy becomes a reality, the “hand off” moment will represent a period of special risk, not because of any failing on the part of computers but rather because of limitations inherent in the brains of human drivers.
The best way to protect ourselves from that period of risk is to eliminate the “hand off” period entirely by ceding total control of driving to computers as soon as possible.
Elon Musk
Elon Musk’s Boring Company selected for Universal Orlando tunnel project
The underground transport tunnel is designed to address the persistent gridlock surrounding International Drive.
Elon Musk’s The Boring Company has been selected for a proposed underground transit system connecting Universal Orlando Resort and the newly opened Universal Epic Universe.
The underground transport tunnel is designed to address the persistent gridlock surrounding International Drive.
As noted in a blooloop report, Universal’s Shingle Creek Transit and Utility Community Development District approved a resolution showing its intent to designate The Boring Company as the contractor for the project.
The agreement covers the full scope of the project, from the tunnel’s design, construction, and maintenance. The project has also been described in public documents as a “point-to-point innovative transportation” initiative with a 25-year agreement.
The proposed Boring Company tunnels would directly link Universal’s existing parks with Epic Universe, which sits roughly three miles away from Universal Orlando Resort. Today, buses are the only direct connection between the two destinations.
Project requirements were quite stringent. Bidders were required to demonstrate at least $75 million in bonding capacity, have a minimum of seven years of operational experience, and show prior delivery of a comparable project valued at $25 million or more within the past 15 years. The Boring Company, thanks in no small part to the Vegas Loop, meets these requirements.
The Orlando selection adds to The Boring Company’s growing portfolio of Loop-style systems. In Las Vegas, the Las Vegas Convention Center Loop has transported more than two million passengers in Tesla vehicles through underground tunnels since 2021. The greater Vegas Loop system is also under construction.
For now, residents in the area seem enthusiastic about the upcoming project. In a comment to Fox35, residents noted that the tunnels could improve traffic in the area.
“We are very congested at certain times and certain hours and that would certainly help with people not having to budget their time,” Mary Walters-Clark, a resident, stated. Another resident, Scott Heinz, echoed similar sentiments. “I think it would be a new opportunity to lessen traffic load and good for visitors as well,” he said.
The tunneling startup has started bringing its Loop projects to international locations. It recently signed a memorandum of understanding with Dubai’s Roads and Transport Authority to explore the development of a 17-kilometer underground Loop network beneath Dubai.
Elon Musk
Elon Musk tops Forbes’ list of America’s 250 greatest innovators
The ranking places Musk at the top of modern American innovation.
Elon Musk has been ranked No. 1 on Forbes’ inaugural list of America’s 250 Greatest Innovators. The ranking places Musk at the top of modern American innovation as the publication kicks off a series celebrating the nation’s 250th anniversary.
Forbes described innovation as “the grease in the economic engine” and the force that transforms industries and creates new ones. The publication highlighted that its honorees are not just inventors, but business leaders who successfully bring breakthroughs to market.
Musk, 54, was ranked No. 1 in this year’s list. Forbes noted that he is “the only person in history to have founded (or grown from nearly nothing) five companies, each with multibillion-dollar valuations, each in a different industry.” Those companies include Tesla, SpaceX, Neuralink, xAI, and The Boring Company.
Forbes’ methodology began with nearly 1,000 nominees submitted by its reporters. A panel of judges, including venture capitalist Jim Breyer, journalist Kara Swisher, and strategy expert Rita McGrath, ranked candidates based on creativity, breadth, engagement, disruption, and commercial impact. Artificial intelligence tools, including ChatGPT and Gemini, were also used to assess candidates before editors finalized the rankings.
The publication noted that more than one-third of the list consists of women and people of color, reflecting shifts in innovation and entrepreneurship over time. All individuals listed are also American citizens, though many were born abroad, including Musk himself. Musk was born in Pretoria, South Africa.
Ranked No. 2 is Jeff Bezos, 61, who Forbes credited with upending America’s $7.4 trillion retail industry through Amazon before pioneering cloud computing with Amazon Web Services. The publication highlighted that Bezos now focuses on space exploration through Blue Origin and artificial intelligence manufacturing systems at Prometheus.
At No. 3 is Bill Gates, 70, who helped launch the personal computing revolution and built Microsoft into the dominant force in workplace software. Forbes also highlighted Gates’ reinvention at age 50 as a data-driven philanthropist, including his role in helping eradicate polio from India.
Elon Musk
Tesla Model Y tops California vehicle sales despite Elon Musk backlash
Data from the California New Car Dealers Association (CNCDA) showed the Model Y outsold its nearest competitor by more than 50,000 units.
The Tesla Model Y was California’s best-selling new vehicle in 2025 for the fourth straight year, despite protests against CEO Elon Musk and a changeover to the Model Y’s updated variant that caused a pause in production and deliveries early in the year.
Data from the California New Car Dealers Association (CNCDA) showed the Model Y outsold its nearest competitor by more than 50,000 units, according to KRON4.
The Model Y recorded 110,120 registrations in California in 2025. The second-best-selling vehicle, the Toyota RAV4, posted 65,604 units, followed by the Toyota Camry at 62,324. The Tesla Model 3 ranked fourth with 53,989 sales, ahead of the Honda Civic at 53,085 units.
Despite leading the state, Model Y sales have trended downward year-over-year. Registrations fell from 132,636 in 2023 to 128,923 in 2024, and then to 110,120 in 2025. Overall Tesla sales in California also declined, dropping from 238,589 in 2023 to 202,865 in 2024 and 179,656 in 2025.
The slowdown comes as the federal $7,500 EV tax credit ended, removing a key incentive that had supported electric vehicle demand for years.
“Tesla has a few advantages. Tesla, as a brand, has a status, cache, so I think folks in certain parts of the Bay. Owning a Tesla is a thing. I think that’s breaking down over time, especially given the political controversies surrounding Mr. Musk,” CNCDA President Brian Maas said.
California saw multiple anti-Musk protests in 2025, along with notable reports of consumer-owned Teslas being vandalized and attacked by protesters and activists. The fact that the Model Y and Model 3 remained strong performers in California is then a testament to the quality and value of the two vehicles.
Tesla’s sales of the Model Y and Model 3 might see an increase this year, as the company has announced that it is sunsetting its two more expensive cars, the Model S and Model X. With the Model S and Model X retired, more consumers will likely go for the Model Y and Model 3.
“Maybe the Model S has outlived its usefulness in terms of attracting customers. It’s no surprise the ones they kept are the Model Y and Model 3,” Maas noted.
Elon Musk’s Boring Company selected for Universal Orlando tunnel project
Elon Musk tops Forbes’ list of America’s 250 greatest innovators
