However, as relatively new traffic features, modern roundabouts are sometimes described as confusing for drivers. One difference between roundabouts and conventional cross-type intersections is the location of pedestrian crosswalks.
Drivers may be less familiar with the location of crosswalks when driving through a roundabout. The Lighting Research Center (LRC) at Rensselaer Polytechnic Institute has developed a concept for roadway illumination called "Ecoluminance" which incorporates roadside vegetation with low-level pedestrian and landscape lighting, retroreflective markers, and light-emitting diode (LED) road and walkway illumination.
In a study sponsored jointly by the New York State Energy Research and Development Authority (NYSERDA) and by the New York State Department of Transportation (NYSDOT), the LRC designed, installed and evaluated new lighting approaches in real-world conditions. Senior Research Scientist John Bullough and LRC Director Mark Rea were the principal investigators for the study.
“Ecoluminance uses a combination of lighting and vegetation to provide visual delineation, illumination for important safety hazards and concerns, and cues about road geometry,” said Bullough.
The ecoluminance concept was implemented at a roundabout in the Town of Bethlehem in Albany County, New York with cooperation from the Town Board and the Public Works, Highway, Planning, and Police Departments. Researchers from the State University of New York College of Environmental Science and Forestry also assisted with the study, and companies General Electric Lighting, Forms + Surfaces and Lightspec Albany donated luminaires to the project.
During two preliminary demonstrations during the summer of 2011, the LRC installed lights and vegetation and obtained feedback from NYSERDA and NYSDOT engineers as well as from town officials and the Town of Bethlehem Bicycle and Pedestrian Committee. Based on this feedback, the LRC installed vegetation and retroreflective markers in the central island of the roundabout, LED landscape lighting to illuminate vegetation and trees, bollards at crosswalks, and LED overhead lighting along sidewalks and the road during the summer of 2012. Roadway edges and pedestrians were more visible than under the conventional lighting, and vehicles approached the roundabout with similar or slightly lower speeds.
Traditional lighting for roundabouts consists of a relatively large number of pole-mounted overhead luminaires, which are relatively expensive to operate because they are energy intensive. The LRC estimates that the initial cost of the ecoluminance system is similar to that of conventional lighting, but the energy use is only about a fourth, resulting in substantially lower energy costs as well as substantially lower light pollution impacts. "The ecoluminance concept could allow transportation agencies to integrate vegetation and lighting while reducing costs and environmental impacts," said Rea.The LRC's report is available online at: https://www.dot.ny.gov/divisions/engineering/
For more information, please visit the LRC website at http://www.lrc.rpi.edu/.Contact:
Rebekah Mullaney | Newswise Science News
Experiments show that a few self-driving cars can dramatically improve traffic flow
10.05.2017 | University of Illinois College of Engineering
Tool helps cities to plan electric bus routes, and calculate the benefits
09.01.2017 | International Institute for Applied Systems Analysis (IIASA)
The world's highest gain high power laser amplifier - by many orders of magnitude - has been developed in research led at the University of Strathclyde.
The researchers demonstrated the feasibility of using plasma to amplify short laser pulses of picojoule-level energy up to 100 millijoules, which is a 'gain'...
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
29.05.2017 | Life Sciences
29.05.2017 | Physics and Astronomy
29.05.2017 | Statistics