A new study concludes that many traffic jams could be prevented if onein five vehicles on the road used new adaptive cruise-control.
"Synchronized flow is, in physics-speak, in unstable equilibrium: The slightest change, such as a driver changing lanes and forcing others to brake, tips the system into a new state. The result is stop-and-go traffic, a true jam.Physicists are exploring whether adaptive cruise control can prevent this. In ACC, a radar sensor gauges the distance between cars, automatically adjusting speed to maintain a safe distance. Because ACC, which has become standard on some luxury vehicles, can adapt instantly if the lead car brakes (humans take about 0.75 second to react), cars can tailgate safely. ACC can therefore pack more cars into a mile of highway, increasing a road's de facto capacity."
[Editor's note: The link below is available to non-subscribers for a period of 6 days.]
Thanks to Chris Steins
FULL STORY: A Few Cars Controlled By Computer Can Keep Rest of Traffic Flowing
Manufactured Crisis: Losing the Nation’s Largest Source of Unsubsidized Affordable Housing
Manufactured housing communities have long been an affordable housing option for millions of people living in the U.S., but that affordability is disappearing rapidly. How did we get here?
Americans May Be Stuck — But Why?
Americans are moving a lot less than they once did, and that is a problem. While Yoni Applebaum, in his highly-publicized article Stuck, gets the reasons badly wrong, it's still important to ask: why are we moving so much less than before?
Using Old Oil and Gas Wells for Green Energy Storage
Penn State researchers have found that repurposing abandoned oil and gas wells for geothermal-assisted compressed-air energy storage can boost efficiency, reduce environmental risks, and support clean energy and job transitions.
Colorado Lawmakers Move to Protect BRT Funding
In the face of potential federal funding cuts, CDOT leaders reasserted their commitment to planned bus rapid transit projects.
Safe Streets Funding in Jeopardy
The Trump administration is specifically targeting bike infrastructure and other road safety projects in its funding cuts.
Six Reasons Why Housing Is a Human Right
Is housing a human right? A law professor shares six reasons why it should be, from its role in protecting other rights to global recognition and U.S. legal traditions. As public support grows, could housing be the next right written into law?
Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
Heyer Gruel & Associates PA
City of Moreno Valley
Institute for Housing and Urban Development Studies (IHS)
City of Grandview
Harvard GSD Executive Education
Salt Lake City
NYU Wagner Graduate School of Public Service
City of Cambridge, Maryland