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Articles on Traffic

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Amazon workers sort packages for delivery on East 14th Street in New York City, July 12, 2022. Michael M. Santiago/Getty Images

How many Amazon packages get delivered each year?

The rise of e-commerce means billions of packages are delivered in the US each year. That creates traffic and pollution, but urban freight researchers are finding better way to get goods to customers.
Pedestrians pass the aftermath of a crash in Gaza City in the Gaza Strip on Oct. 11, 2021. Majdi Fathi/NurPhoto via Getty Images

Deaths and injuries in road crashes are a ‘silent epidemic on wheels’

Traffic crashes kill and injure millions worldwide every year and are a major drain on economic development. Improving road safety would produce huge payoffs, especially in lower-income countries.
Self-driving cars could lead to increased traffic and pollution if they spur more travel by car. Witthaya Prasongsin via Getty Images

Driverless cars won’t be good for the environment if they lead to more auto use

Studies show that when people can ride in a car without having to operate it, they increase their car use. That could increase traffic and pollution, unless government puts a price on car travel.
Low-cost air-ventilation systems have been installed in many classrooms across the U.S. to help reduce COVID-19 transmission. Halfpoint Images/Moment via Getty Images

COVID-19 has spurred investments in air filtration for K-12 schools – but these technologies aren’t an instant fix

Air-ventilation upgrades have been badly needed in U.S. classrooms since long before the pandemic. Low-tech filtration systems that cost about the same as a textbook per student can make a big difference.
The likelihood of commuting during both peak periods was slightly lower for telecommuters than for workers who commuted to work. (Shutterstock)

Telecommuting can reduce congestion, but might create other traffic problems

The potential benefits of telecommuting could quickly be erased because of the behavioural changes it brings about in the medium and long term.
It’s back: Rush-hour traffic in Los Angeles on June 15, 2021. Carolyn Cole / Los Angeles Times via Getty Images

As urban life resumes, can US cities avert gridlock?

The pandemic offered a tantalizing look at city life with fewer cars in the picture. But with traffic rebounding, there’s limited time to lock in policies that make streets more people-friendly.
Left turns are dangerous and cause a lot of unnecessary traffic. Chris Jongkind/Moment via Getty Images

Sick of dangerous city traffic? Remove left turns

Left turns are dangerous and slow down traffic. One solution? Get rid of them. New research shows that limiting left turns at busy intersections would improve safety and reduce frustrating backups.

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