People can be pretty remiss when it comes to post-toilet handwashing. Most people also tend to have a strong resistance to leaving a public toilet unflushed.
Today’s invention attempts to use the second tendency to overcome the first.
Imagine a toilet flush button (or handle), located within an adjacent basin, which will only work after a sensor (of the type currently used in hand driers) has detected hand movements and water flow within the basin for several seconds. The natural tendency to flush is thus only enabled after a certain amount of handwashing has occurred.
This would also have the advantage that the flush activation mechanism was itself constantly being washed.