The row points to a practical visibility issue: floor markings were becoming difficult to read near vehicle and pedestrian routes. The issue was not whether a safety or visual rule existed. It was whether people on site could recognize it quickly enough during normal operation.
The row records color selection, projection distance, artwork or image requirements, installation conditions, ambient light conditions, equipment quantity (10 to 20 units, 10 metres, 3000 lux, 20 units, above 3000 lux). Those details define what can be said without adding unsupported parameters.