For many drivers, the only experience more aggravating than being stuck in traffic is not being able to figure out why there's a jam in the first place. An explanation of the phenomenon called "Traffic Waves" may help ease the aggravation.
What's the likely cause for congestion during your commute? Collision? Construction? Guess again. Most congestion is caused by traffic waves, "a phenomenon that’s been exasperating drivers since the first cars started coming off Ford’s assembly line a century ago," writes Matthew Green.
"The simplest explanation for why traffic waves happen is that drivers have relatively slow reaction times: if the car in front of you suddenly slows down, it’ll likely take you a second or so to hit the brakes. The slower your reaction time, the harder you have to brake to compensate and keep a safe distance. The same goes for the car behind you, which has to brake even harder than you did in order to slow down faster. And so on down the road, in a domino-like effect," he explains.
To see this effect in action, play with the interactive visualization created by programmer Lewis Lehe, a civil engineering graduate student at UC Berkeley.
FULL STORY: What Are Traffic Waves and Why Do They Happen So Much?

Trump Administration Could Effectively End Housing Voucher Program
Federal officials are eyeing major cuts to the Section 8 program that helps millions of low-income households pay rent.

Planetizen Federal Action Tracker
A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

Ken Jennings Launches Transit Web Series
The Jeopardy champ wants you to ride public transit.

Driving Equity and Clean Air: California Invests in Greener School Transportation
California has awarded $500 million to fund 1,000 zero-emission school buses and chargers for educational agencies as part of its effort to reduce pollution, improve student health, and accelerate the transition to clean transportation.

Congress Moves to End Reconnecting Communities and Related Grants
The House Transportation and Infrastructure Committee moved to rescind funding for the Neighborhood Equity and Access program, which funds highway removals, freeway caps, transit projects, pedestrian infrastructure, and more.

From Throughway to Public Space: Taking Back the American Street
How the Covid-19 pandemic taught us new ways to reclaim city streets from cars.
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