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/.
Lighting Research Center
Rensselaer Polytechnic Institute
Rebekah Mullaney | Source: Newswise Science News
Further information: www.rpi.edu
Further Reports about: conventional cross-type intersections > Ecoluminance > environmental impact > LED > LIGHT > Lighting > LRC > NYSERDA > pedestrian crosswalks > road geometry > Roundabouts > visual delineation
More articles from Transportation and Logistics:
Siemens to automate the two busiest commuter lines in the USA
20.11.2013 | Siemens AG
Putting an aircraft in the cooler
07.11.2013 | Fraunhofer Institute for Building Physics IBP
The Light: Global study gets underway with online user survey
Light has a fundamental impact on our sense of well-being and performance. In cooperation with Zumtobel, a supplier of lighting solutions, Fraunhofer IAO has launched a global user survey of lighting quality in offices. The objective is to identify the best lighting conditions for a variety of spaces and lighting ...
Quantum entanglement, a perplexing phenomenon of quantum mechanics that Albert Einstein once referred to as “spooky action at a distance,” could be even spookier than Einstein perceived.
Physicists at the University of Washington and Stony Brook University in New York believe the phenomenon might be intrinsically linked with wormholes, hypothetical features of space-time that in popular science fiction can provide a much-faster-than-light shortcut from one part of the universe to another.
But here’s the catch: One couldn’t actually ...
A star is formed when a large cloud of gas and dust condenses and eventually becomes so dense that it collapses into a ball of gas, where the pressure heats the matter, creating a glowing gas ball – a star is born.
New research from the Niels Bohr Institute, among others, shows that a young, newly formed star in the Milky Way had such an explosive growth, that it was initially about 100 times brighter than it is now. The results are published in the scientific journal, Astrophysical Journal Letters.
The young ...
EPFL scientists have shown how to achieve a dramatic increase in the capacity of optical fibers; Their simple, innovative solution reduces the amount of space required between the pulses of light that transport data
Optical fibers carry data in the form of pulses of light over distances of thousands of miles at amazing speeds. They are one of the glories of modern telecommunications technology.
However, their capacity is limited, because the pulses of light need to be lined up one after the other in ...
NASA's Hurricane and Severe Storms Sentinel airborne mission known as HS3 wrapped up for the 2013 Atlantic Ocean hurricane season at the end of September, and had several highlights. HS3 will return to NASA’s Wallops Flight Facility in Wallops Island, Va., for the 2014 Atlantic hurricane season.
During the 2013 mission, two unmanned Global Hawks flew from Wallops for the first time. The mission highlights included studying the Saharan Air Layer, following the genesis of a tropical storm, finding a unique hybrid core or center circulation in a redeveloped storm, obtaining measurements on the strongest side of ...
05.12.2013 | Health and Medicine
05.12.2013 | Ecology, The Environment and Conservation
05.12.2013 | Information Technology
05.12.2013 | Event News
04.12.2013 | Event News
12.11.2013 | Event News