R. BOUWMEESTER & ASSOCIATES
Sun & Shadow Position Specialists
with Modeling Applications in
Collision and Crime Scene Reconstruction,
Urban Development, Site Planning and Building Design
||What We Do
Sun Glare while Driving
To provide photographic examples of the
effects of sun glare while driving.
samples were taken with sun altitudes between 2 and 7 degrees.
these photos, the camera automatically reduced the intensity of the sun's
glare. Actual intensities were much greater, to the point of causing
how difficult it is to see into the shadows (Figs 1 and 2).
how quickly visibility can deteriorate (Fig 2).
how road grade can change the effective height of the sun (Fig 3).
what can NOT be seen when the sun is close to one's line of sight (Fig 4).
1 - Bright Sun / Dark Shadows
(Sun at about 7 degrees above
Note darkness of
2 - Sudden change in visibility conditions
(Sun at about 6.5 degrees above
Note darkness of shadows.
School on left, crosswalk ahead, and intersecting street on
Note how relatively good
visibility can deteriorate in a matter of seconds.
(4 seconds between photos
in this example)
3 - Sun appears lower due to climbing road grade
(Sun at 3.5 degree altitude
(apparent height is less))
Note how apparent height of sun
is reduced by climbing road grade.
4 - Sun glare obscures important objects
(Sun at about 2 degrees above
Note what is NOT visible in
...and a Stop Sign!!
Ralph Bouwmeester, P. Eng.
R. Bouwmeester & Associates
Barrie, Ontario Canada
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