Comments :
Picture taken with a FR-60 flash illuminator, and with a splitting filter. The faces of the drivers and the background are correctly illuminated by the flash. As the licence plates and the warning triangles are made in a retro-reflective material, the light that hits these parts is mainly reflected to the camera. The licence plates are over-exposed on the main picture, and it is unlikely that ALPR (Automated Licence Plate Reader) system can read the signs it bears.
The splitting filter duplicates the picture, and creates on the same frame a "ghost picture" approximately 4 f-stops less exposed ; the shiny parts on the original picture apperar twice, but less exposed, and slightly shifted down.
The signs on the "ghost plates" now appear, and can be recognized by ALPR systems.

Comments :
Picture taken without flash, and with a splitting filter. The licence plates are easy to identify by an ALPR system, but the driver's face is not visible. In this case, the splitting filter has no noticeable effect (no over-exposed surfaces on the picture). In fact, a secondary picture ("ghost picture") is created by the splitting filter, but as it is very under exposed compared to the main one, it seems to be invisible. If you take a closer look at the zone of the picture under the white panels (20, 25 and 40) you may notice a very faint duplication of these panels, due to the splitting filter !