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To determine the correct mirror size:

  • Estimate the distance in metres from the viewer to the proposed mirror location.
  • Estimate the distance in metres from the proposed mirror location to the area/object to be observed.
  • Add up these two distances. Use the table below to choose the appropriate mirror size. If in doubt, choose the larger size.


Size of mirror (diameter) Distance                              
300mm Up to 12 metres
450mm Up to 15 metres
600mm Up to 20 metres
760mm Up to 25 metres
1000mm Over 25 metres

Note: Viewing distances are only a guideline and are recommended based on straight viewing. It is recommended to go up a size or two with multiple intersections or poor lighting areas.

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