Featured Research

from universities, journals, and other organizations

Stop-And-Go Traffic: An Accident? Construction Work? No, Just Too Much Traffic

Date:
March 5, 2008
Source:
Institute of Physics
Summary:
A new study from a Japanese research group explains why we're occasionally caught in traffic jams for no visible reason. The real origin of traffic jams often has nothing to do with obvious obstructions such as accidents or construction work but is simply the result of there being too many cars on the road.

Researchers used a circular track with a circumference of 230m. They put 22 cars on the road and asked the drivers to go steadily at 30km/h around the track. While the flow was initially free, the effect of a driver altering his speed reverberated around the track and led to brief standstills.
Credit: Image courtesy of Institute of Physics

A new study from a Japanese research group explains why we're occasionally caught in traffic jams for no visible reason. The real origin of traffic jams often has nothing to do with obvious obstructions such as accidents or construction work but is simply the result of there being too many cars on the road.

Related Articles


The research, published March 4 in the New Journal of Physics, shows how model patterns, normally used to understand the movement of many-particle systems, have been applied to real-life moving traffic. The research shows that even tiny fluctuations in car-road density cause a chain reaction which can lead to a jam.

The research found that tiny fluctuations in speed, always existing when drivers want to keep appropriate headway space, have a cumulative effect. Once traffic reaches a critical density, the cumulative effect of gentle braking rushes back over drivers like a wave and leads to a standstill.

The researchers in Japan used a circular track with a circumference of 230m. They put 22 cars on the road and asked the drivers to go steadily at 30km/h around the track. While the flow was initially free, the effect of a driver altering his speed reverberated around the track and led to brief standstills.

Yuki Sugiyama, physicist from Nagoya University, said, "Although the emerging jam in our experiment is small, its behaviour is not different from large ones on highways. When a large number of vehicles, beyond the road capacity, are successively injected into the road, the density exceeds the critical value and the free flow state becomes unstable."

The researchers will be advancing their research by using larger roads and more vehicles to further test their findings.

The research suggests that it might be possible to estimate critical density of roads, making it possible to build roads fit for the number of drivers needing use of it or, on for example toll roads, only allowing the right number of cars access to the road to stop mid-flow traffic jams.


Story Source:

The above story is based on materials provided by Institute of Physics. Note: Materials may be edited for content and length.


Cite This Page:

Institute of Physics. "Stop-And-Go Traffic: An Accident? Construction Work? No, Just Too Much Traffic." ScienceDaily. ScienceDaily, 5 March 2008. <www.sciencedaily.com/releases/2008/03/080304075707.htm>.
Institute of Physics. (2008, March 5). Stop-And-Go Traffic: An Accident? Construction Work? No, Just Too Much Traffic. ScienceDaily. Retrieved March 27, 2015 from www.sciencedaily.com/releases/2008/03/080304075707.htm
Institute of Physics. "Stop-And-Go Traffic: An Accident? Construction Work? No, Just Too Much Traffic." ScienceDaily. www.sciencedaily.com/releases/2008/03/080304075707.htm (accessed March 27, 2015).

Share This


More From ScienceDaily



More Science & Society News

Friday, March 27, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Why So Many People Think NASA's Asteroid Mission Is A Waste

Why So Many People Think NASA's Asteroid Mission Is A Waste

Newsy (Mar. 27, 2015) The Asteroid Retrieval Mission announced this week bears little resemblance to its grand beginnings. Even NASA scientists are asking, "Why bother?" Video provided by Newsy
Powered by NewsLook.com
Indiana Permits Needle Exchange as HIV Cases Skyrocket

Indiana Permits Needle Exchange as HIV Cases Skyrocket

Reuters - US Online Video (Mar. 26, 2015) Governor Mike Pence declares the recent HIV outbreak in rural Indiana a "public health emergency" and authorizes a short-term needle-exchange program. Rough Cut (no reporter narration) Video provided by Reuters
Powered by NewsLook.com
AAA: Distracted Driving a Serious Teen Problem

AAA: Distracted Driving a Serious Teen Problem

AP (Mar. 25, 2015) While distracted driving is not a new problem for teens, new research from the AAA Foundation for Traffic Safety says it&apos;s much more serious than previously thought. (March 25) Video provided by AP
Powered by NewsLook.com
Obama: Affordable Care Act 'saving Lives'

Obama: Affordable Care Act 'saving Lives'

AP (Mar. 25, 2015) Speaking at a White House event marking the fifth anniversary of the Affordable Care Act, President Barack Obama says the law is "saving lives that touch all of us." (March 25) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Science & Society

Business & Industry

Education & Learning

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins