Citibike station in midtown Manhattan.
Dozens of US cities have launched bike-share programs in the past decade. There have been bumps – critics want wider access, and cities want bikes stored out of the way – but bike sharing is on a roll.
In the cockpit of an aircraft, the hierarchy between captain and co-pilot is strictly respected. At the risk, sometimes, of poor decisions being made.
Fuel economy and air pollution regulations have lowered pollution and pushed industry to innovate.
The Trump administration announced a plan to relax fuel economy standards, but well-designed regulations can drive clean car innovations that make U.S. industry globally competitive.
Where’s my bus?
Even in cities with good public transportation, some areas can be 'transit deserts,' where demand exceeds supply. Living in these zones makes it hard to access good jobs, health care and other services.
Buses are set to be replaced by private and autonomous vehicles – but it's not clear how society is going to deal with it.
Times Square traffic jam.
New York soon may charge a fee to drive into central Manhattan as a way of reducing traffic and raising funds for public transit. An urban scholar says this step is overdue in the United States.
Wages are low among hospitality workers, who are disproportionately female.
Women in minimum wage jobs earn 10% less than their male peers. Wages are systematically lower in jobs more commonly held by women.
Riders on San Francisco’s Muni light rail system.
Millions of Americans rely on public transit to get to school, work or stores, but many can't get the service they need. 'Uberizing' transit by offering more options on demand could fill the gaps.
A self-driving shuttle at Texas A&M.
Combining machine learning, artificial intelligence and autonomous vehicles could revolutionize how people with disabilities get around their communities.
Ride-hailing app drivers – partners or exploited labour?
Using technology and rhetoric, ride-hailing companies manage to dictate drivers while simultaneously creating the illusion of equal relation.
Is it safe to cross?
Duke Humans and Anatomy Lab
Pedestrians ensure their safety by making eye contact with human drivers. Autonomous cars will have to communicate with nearby people in other ways.
When is it too hot to fly?
Major airports around the world will see more frequent flight restrictions in the coming decades because of increasingly common hot temperatures.
How will we react when cars start driving themselves?
How might we, and our nation's roads and highways, need to change as autonomous vehicles become more ubiquitous? We know a lot of the answers, but not all of them.
Sales of electric vehicles are growing fast, especially in Europe.
Shifting to plug-in cars wouldn't be enough to max out global oil consumption by 2040. But it could help make that happen if cities pitch in and ride-sharing doesn't crowd out public transportation.
Many Americans need reliable public transit to get to school or work.
Many Americans live in transit deserts – areas where demand for transit exceeds the supply. To fix these gaps, we need to find and map them so agencies can add transit options in the right places.
How can we ensure technology brings prosperity to us all?
Political and community leaders must act now to preserve the American middle class and adapt the US economy for the 21st century.
Circulation out of control.
Analysis of the phenomenon of "total circulation" -- situations in which humanity produces a circulation of goods or persons that escapes its control.
Los Angeles Police Chief Charlie Beck, left, and Mayor Eric Garcetti pose next to an all-electric car in this 2015 photo.
AP Photo/Nick Ut
More than 200 mayors have committed their cities to stick with the Paris climate deal no matter what the US does. Electric vehicles offer a promising route to making good on that pledge.
Will flying cars ever really take off?
Flying cars have been the stuff of science fiction for years, and now companies are now starting to look at such options. But what will it take to get our cars off the ground?
Everyone looks for price, but there are smarter ways to communicate fuel efficiency on car labels.
It's all in the presentation: In studies, consumers were more apt to choose fuel-efficient vehicles depending on how the same pieces of information were displayed on labels.