Are Polaroid headlights the solution to reducing night-time road accidents?

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Discussion Overview

The discussion centers on the potential use of polaroid filters in vehicle headlights to reduce glare and subsequently lower night-time road accidents. Participants explore the historical context, technological advancements, and practical implications of implementing such systems in modern vehicles.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant notes that polaroid filters could eliminate glare from headlights, potentially reducing night-time road accidents.
  • Another participant expresses concern that the filters would significantly reduce light transmission, dimming headlights and possibly creating more hazards in certain conditions.
  • It is mentioned that the effectiveness of polaroid filters may be compromised in rainy conditions due to de-polarisation effects.
  • A participant raises the issue that polarising filters would need to be applied to both headlights and windscreens, or alternatively, drivers would need to wear sunglasses.
  • There is uncertainty about whether retro-reflectors would function properly with the addition of polarising filters.

Areas of Agreement / Disagreement

Participants express differing views on the practicality and effectiveness of polaroid headlights. While some see potential benefits, others highlight significant drawbacks and challenges, indicating that the discussion remains unresolved.

Contextual Notes

Participants mention various limitations, such as the need for additional equipment (filters on windscreens) and the impact of environmental conditions (e.g., rain) on the effectiveness of polaroid systems.

ananthu
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I have studied,as one of the uses of polaroids is, that it can be fitted in the head lights of cars and other vehicles to eliminate the glare. This will certainly act as a boon to the motorists and result in considerable reduction of road accidents during the night time.

I have also learned that Edwin Land had pioneered in this field as early as 1930's and took sincere efforts to design such polaroid sheets through his company the Polaroid corporation and tried to obtain patent for promoting it for commercial use, but only unsuccessfully.

Now with the tremendous advancement in technology, are the modern cars coming to the market fitted with any such anti glare headlights? Has any country such as US or UK made it mandatory for fitting such glasses to the headlights of automobiles to avoid accidents?

In India,whenever I ride on my bike during night hours, I used to think of such scenario, facing the annoying glare of headlights of the vehicles coming from the opposite direction, causing potential risk to the drivers.
 
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The filters required don't let much light through. So it's not just the headlights that are dimmed.
 
CWatters said:
The filters required don't let much light through. So it's not just the headlights that are dimmed.

In principle, the idea seems very attractive but there are a number of practical difficulties.

This system would reduce effective illumination by half, even with perfect polarisers. It wouldn't be as useful in rainy conditions with a wet windscreen because of the de-polarisation.
I have a feeling that a full beam in the eyes when the polariser system wasn't actually working fully could be worse than what you get nowadays with properly dipped headlights.
 
Not only would you have to fit the polarising filters to the headlights, you'd have to fit them to windscreens too, or else make everyone wear sunglasses.

I'm not sure, but it might also make retro-reflectors not work properly?