The front driveway of the house we bought has been made with coarse
granite-type grey gravel of 1"-2" pieces. It is not stable and will
rut when - say even a garbage bin is wheeled over it. Perhaps the
previous owners never finished the project...

Can anyone suggest what can be added as a layer over it which will
bind it and make it solid, stable and less painful to walk on in bare
feet! :-) Crusher-dust was one suggestion, should it be watered in to
fill the gaps around the stones or what?

Ron