Today’s invention is intended to contribute to road safety.
If, for example, occupants of a vehicle have not put on their seatbelts when the engine is started, a beefed-up windscreen washer spray operates, whilst disabling the wipers.
Water is sprayed from the top edge of the screen and collected in a trough at the bottom…so that the water for this purpose never runs out.
The screen is thus impossible to see through and stops anyone driving away until the belts are properly attached.
A modified version of this approach would spray just enough water on the screen to force the driver to slow down greatly or stop, even with the wipers operating.
This might be deployed if a camera in the driver’s headrest spotted unfamiliar alphanumerics or other graphics in its image, which would be indicative of either texting or reading whilst driving.