Road lighting
AssigneeLumileds LLC
InventorsMichael CAMRAS, Jyoti Kiron BHARDWAJ
Life of this patent
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Abstract
Systems, devices, and methods are disclosed in which one or more light sources, a detector, a processor and a controller are configured such that light from the one or more light sources improves the ability of a human or automated motor vehicle driver to identify and avoid pedestrians. The one or more light sources may provide spot illumination to moving objects or pedestrians on a road surface, with the spot illumination following the moving object or pedestrians along the portion of the road surface. The one or more light sources may project images on the ground or on other surfaces. The light source may be carried by a pedestrian or on personal transport used by a pedestrian. The light sources may be stationary and provide lighting for a pedestrian street crossing.
Claims22
A road lighting system deployed on or near a roadway, the road lighting system comprising:
- one or more light sources;
- one or more detectors arranged to detect a pedestrian on or near the roadway;
- a processor configured to receive and process signals from the one or more detectors;
- and
- a controller configured to receive signals from the processor and in response control the one or more light sources to illuminate a portion of the road surface and to provide spot illumination to the pedestrian that tracks the pedestrian as the pedestrian moves on or near the roadway;
- wherein the illumination of the pedestrian from the one or more light sources comprises a vertical illuminance component in a plane perpendicular to the roadway and a horizontal component in a plane parallel to the roadway, and the vertical illuminance component is at least twice the horizontal illuminance component.
A road lighting system deployed on or near a crosswalk in a roadway, the road lighting system comprising:
- one or more light sources located above the crosswalk;
- one or more light sources located at an end of the crosswalk;
- one or more detectors arranged to detect a pedestrian on or near the roadway;
- a processor configured to receive and process signals from the one or more detectors;
- a controller configured to receive signals from the processor and in response control the one or more light sources locate above the crosswalk and control the one or more light sources located at an end of the crosswalk to illuminate a portion of the crosswalk and to provide spot illumination to the pedestrian that tracks the pedestrian as the pedestrian moves on or near the roadway;
- wherein the illumination of the pedestrian from the one or more light sources located above the crosswalk comprises a vertical illuminance component in a plane perpendicular to the roadway and a horizontal component in a plane parallel to the roadway, and the vertical illuminance component is less than the horizontal illuminance component;
- and
- wherein the illumination of the pedestrian from the one or more light sources located at an end of the crosswalk comprises a vertical illuminance component in a plane perpendicular to the roadway and a horizontal component in a plane parallel to the roadway, and the vertical illuminance component is greater than the horizontal illuminance component.
Dependencies are inferred from the claim text.