Navigation Links
The 'twilight zone' of traffic costs lives at stoplight intersections
Date:3/14/2012

CORVALLIS, Ore. Hundreds of lives are being lost each year in the United States because of mistakes made in what engineers call the "dilemma zone" that area before a stoplight intersection where the traffic light turns yellow and the driver isn't sure whether to stop or go ahead.

New research at Oregon State University will help to more precisely identify that danger zone. Traffic engineers can then use than information, along with advanced technology that can monitor the speed and location of oncoming traffic, to improve yellow-light timing and help address this problem.

When more widely implemented, this approach should help reduce driver confusion, add certainty to how intersections should be managed, and save lives.

"There are more than 30,000 traffic fatalities each year in the U.S., and about 2,000 of them occur in stoplight intersections," said David Hurwitz, an OSU assistant professor of transportation engineering. "We think those crashes can be reduced with a better understanding of exactly where the dilemma zone is and how traffic lights and other technology can be adjusted to help manage it."

Factors that lead to the problems in the dilemma zone include driving speed, distance to the stop light, driver skills, laws that vary by state, occasional scofflaws who are trying to "beat the red light," and simple confusion by drivers who want to do the right thing but aren't sure what it is.

There are many variables involved, Hurwitz said, such as vehicle speed and position. To help address that, researchers in one recent study used a tool called "fuzzy logic." This provides a way to produce more exact decisions with inexact data, which in this case can include everything from drivers with very different skill sets and reaction times to automobile speeds and road variability.

Based on their speed and proximity to an intersection, when the traffic light turns yellow a driver has to make a decision whether to stop or proceed. A driver who is some distance away usually stops; and a driver who is extremely close to the intersection usually will go ahead. Those decisions are fairly easy. But the "dilemma zone" is the area where the choice isn't so obvious, and the wrong decision can have serious, sometimes fatal consequences.

Complicating that, Hurwitz said, is that laws vary widely by state. In Oregon, for instance, the law requires that a car stop on a yellow light if it is safe to do so. In some other states, it's legal to proceed on a yellow light, and even be in the intersection during a red light, if the front axle of the vehicle crosses the stop line before the light turns red.

Different laws can contribute to different driver behaviors, and national standards do not now exist.

Stop too suddenly, and you're apt to have a rear-end collision with the vehicle behind you. Proceed or turn left when you shouldn't, and even more serious crashes can occur, including head-on and side impacts. And based on the speed limit, the length of a yellow light at an intersection can vary greatly.

"In traffic engineering, consistency and uniformity is a critical concern," Hurwitz said. "We want conscientious drivers to know what is the right thing to do. Given so many variables and differences in state law, that can be difficult."

The findings have been published in two recent studies, in research that was supported by the Vermont Agency of Transportation and the Lilo and Richard Smith Transportation Fellowship.

"We want to help drivers know whether to stop or proceed, and do it in a manner that is safe," Hurwitz said. "This approach should help accomplish that, prevent accidents and save lives."


'/>"/>
Contact: David Hurwitz
david.hurwitz@oregonstate.edu
541-737-9242
Oregon State University
Source:Eurekalert

Related medicine news :

1. Clarity Group, Inc. Announces Launch of Portal 2.0, the Next Generation of the Healthcare SafetyZone Portal
2. Optelec Gets Creative: CSUN San Diego and VisionZone Premier with Special Movie Debut
3. Zone Diet Devotees Set Sail with Dr. Barry Sears on Zone Cruise to Better Health
4. KCAA Radio Features Dr. Barry Sears, Creator of Zone Diet, on U.S. Obesity Crisis
5. Surfline Launches "Shark Month" Presented by Casio G'zOne
6. Clear Channel's “Penn Project” Features Dr. Barry Sears, Zone Diet Creator, About Obesity in America
7. Can multiple sclerosis attacks be minimized in a war zone?
8. Zone Diet Creator Dr. Sears Discusses Obesity Causes and Solutions on Mel Robbins Radio Show
9. Zone Labs' CEO Etholm Discusses Entrepreneurial Opportunity in America, on WMST Radio
10. Berkeley study shows ozone and nicotine a bad combination for asthma
11. Nonmilitary More Likely to Return to War Zone After Psych Condition
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/26/2016)... ... ... PawPaws brand pet supplements owned by Whole Health Supply is ... of felines. The formula is all-natural and is made from Chinese herbs that have ... Kidney Support Supplement Soft Chews are Astragalus Root Extract and Rehmannia Root Extract ...
(Date:6/25/2016)... , ... June 25, 2016 , ... ... policy issues and applications at AcademyHealth’s Annual Research Meeting June 26-28, 2016, at ... on several important health care topics including advance care planning, healthcare costs and ...
(Date:6/25/2016)... (PRWEB) , ... June 25, 2016 , ... "With 30 ... their specific project," said Christina Austin - CEO of Pixel Film Studios. , ... and all within Final Cut Pro X . Simply select a ProHand generator ...
(Date:6/25/2016)... ... June 25, 2016 , ... Dr. ... from injury. Recently, he has implemented orthobiologic procedures as a method for treating ... one of the first doctors to perform the treatment. Orthobiologics are substances that ...
(Date:6/24/2016)... (PRWEB) , ... June 24, 2016 , ... A recent ... that most people are unfamiliar with. The article goes on to state that individuals ... also many of these less common operations such as calf and cheek reduction. The ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)...   Pulmatrix, Inc ., (NASDAQ: PULM ... announced today that it was added to the Russell ... comprehensive set of U.S. and global equity indexes on ... milestone for Pulmatrix," said Chief Executive Officer Robert ... progress in developing drugs for crucial unmet medical needs, ...
(Date:6/23/2016)... Research and Markets has announced the addition of ... report to their offering. ... kidney failure, it replaces the function of kidneys by removing ... thus the treatment helps to keep the patient body,s electrolytes ... Increasing number of ESRD patients & substantial healthcare expenditure ...
(Date:6/23/2016)... , June 23, 2016 Roche (SIX: ... 510(k) clearance for its Elecsys BRAHMS PCT (procalcitonin) assay ... sepsis or septic shock. With this clearance, Roche is ... a fully integrated solution for sepsis risk assessment and ... with bacterial infection and PCT levels in blood can ...
Breaking Medicine Technology: