Demonstration of roundabout lighting based on the ecoluminance approach.
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2012-08-01
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Abstract:"Roundabout lighting consisting of pole-mounted high pressure sodium luminaires can be energy intensive
and does not necessary provide clear delineation for drivers and pedestrians navigating a roundabout. Using
the ecoluminance concept developed in a previous study, lighting integrated with vegetation using lower
mounting heights and reflected light from plants and retroreflective elements, it could be possible to
provide illumination at a roundabout using substantially less energy. Two short term lighting
demonstrations, using the ecoluminance approach and using lower-wattage luminaires producing “white”
illumination, were conducted at a real-world roundabout location in New York State. Feedback from
transportation engineers and members of the public was used to refine the ecoluminance concept for a final
lighting demonstration, consisting of shrubs and trees in the central roundabout island, landscape lighting
for these items, pedestrian bollard lighting at crosswalks, overhead light-emitting diode (LED) luminaires
in sidewalk and roadway areas, and retroreflective markers to delineate the perimeter of the central island.
Photometric measurements confirmed the simulations performed during the design phase, and supported
that pedestrians and roadway elements were visible to drivers and pedestrians. Observations of approaching
vehicle speeds with the ecoluminance system installed and with the conventional lighting installed revealed
little difference in approach speeds. The ecoluminance system had similar initial costs, mainly because of
high LED equipment costs (which are decreasing over time) and used only one-fourth the energy of the
conventional roundabout lighting system."
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