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What is the benefit of measuring three observation angles?

April 26, 2017benefit measuring observation

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What is the benefit of measuring three observation angles?

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The main observation angle (as measured by RetroSign GR1) mainly show the retroreflection as observed by the driver in a passenger car. The additional observation angles offered by RetroSign GR3 shows the retroreflection as seen by a driver in a lorry or other large vehicles.