Field of View from Automotive Vehicles 125
OTHER VISIBILITY ISSUES
light transmissivity
In the above-discussed eld-of-view analyses, it was assumed that if any of the targets are located
in the window openings, they will be visible to the driver. The visibility of the targets, however,
depends on the visual contrast of the targets and the luminance of the background of the targets.
The luminance of the targets and their backgrounds are affected by light transmission losses in
the glass used for the windshield and other window openings. The light transmissivity depends on
the type of glass, glass thickness, and installation (i.e., rake) angles. The light transmission losses
increase with an increase in rake angle and glass thickness. The