CrazyEngineers Archive
Old, but evergreen and popular discussions on CrazyEngineers, presented to you in read-only mode.
@charumathi • 15 Jan, 2009
what is the element used in roads for signalling which is red colour and glows in night like radium?
@gohm • 26 Jan, 2009 Re: What material is used in road-side signals to make them glow when light falls on

Can you be a bit more specific? I cannot tell if you are talking about signal lights, signs or pavement markings?
@Ashraf HZ • 26 Jan, 2009 Re: What material is used in road-side signals to make them glow when light falls on

If you are referring to Cats eyes (the road markings) and signs, these are reflectors of light rather than them glowing, making use of principles of optics.
@charumathi • 01 Feb, 2009 Re: What material is used in road-side signals to make them glow when light falls on

no i was saying the red sticker or paint something else that is found in milestones....i wish to know what was the element present in it makes glow at night....
@quartz • 01 Feb, 2009 Re: What material is used in road-side signals to make them glow when light falls on

Here you have what you need:
Retroreflector - Wikipedia, the free encyclopedia

The same principe is used in your red stickers...
Alot of small crystals (size between dust and sand) are trapped in the transparent reddish plastic.
And the shape of those crystals are made to reflect back the incoming light.

Or a single transparent plasic is processed with a laser to modify its internal structure to creat some reflecting shapes...

It is not a specific metarial... but an optical structure...
@charumathi • 01 Feb, 2009 Re: What material is used in road-side signals to make them glow when light falls on

thank you frnd.😀
8.7k views

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