Modeling Driver Vision 209
Example 2: Target Visibility in the Presence of a Glare Source
Determine the target visibility in Example 1 above if a glare source of 2000 cd is located at 122 m
(400 ft) from the driver and at 2 degrees from the driver’s line of sight to the target.
The output of the model presented in Table 12.2 shows that since the value of C/C
tha
is less than
1.0, the target will not be visible to the driver.
Comparing values provided in Table 12.2 with the corresponding values in Table 12.1, the fol-
lowing observations can be made:
1. The contrast value (given in line 5 of the above output tables) changed from 7.409 when the
glare source was absent to 0.041 when the glare source was present.
2. The driver’s adaptation lumi ...