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LED road studs linked to traffic lights to guide drivers at complex junction

Lisa Miles
Intelligent 'cat's eyes' to mark the lanes? Genuis idea!

May have helped that road user in the right hand lane on the roundabout junction last week to understand that they should have gone around and come back around the roundabout instead of turning left, across the front of three lanes of traffic... >:(
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    There was a 100 metre run of LED centre line studs that appeared nearby (no road works that I noticed) a few years ago. Then the strip got shorter and finally disappeared, perhaps they proved to be unreliable. I think they flickered in my peripheral vision. I certainly see that with the WAIT signs at pedestrian crossing when I turn my head while driving. It isn't the direction of seeing but the movement of the head. That suggests that it is the eye that is doing the strobing, (rather like the 'grill' in front of a PIR detector that makes a steady heat source appear to fluctuate as it moves). Compared to other light sources LEDs are very much 'point source', something that doesn't seem to have been considered with respect to 'human factors'. It is incredible to me that large light sources such as fluorescent tubes were considered to produce glare but intense LED sources "don't". [Drifting off-topic, need concrete barriers!]
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  • 0
    There was a 100 metre run of LED centre line studs that appeared nearby (no road works that I noticed) a few years ago. Then the strip got shorter and finally disappeared, perhaps they proved to be unreliable. I think they flickered in my peripheral vision. I certainly see that with the WAIT signs at pedestrian crossing when I turn my head while driving. It isn't the direction of seeing but the movement of the head. That suggests that it is the eye that is doing the strobing, (rather like the 'grill' in front of a PIR detector that makes a steady heat source appear to fluctuate as it moves). Compared to other light sources LEDs are very much 'point source', something that doesn't seem to have been considered with respect to 'human factors'. It is incredible to me that large light sources such as fluorescent tubes were considered to produce glare but intense LED sources "don't". [Drifting off-topic, need concrete barriers!]
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