Originally Posted by
electrik
I used that for years, motorists didn't have a clue what it meant(nor the slowing down sign).... now i just point where i'm going - even a dog can understand that. ...
Wrong. Point and a dog thinks you want it to go there or there is something of interest there, not that that's where you're going. That's the general interpretation of pointing. Conventional hand signals with palm flat and fingers extended together are designed to be distinct from pointing and indicate your intention to go in that direction, rather than pointing out something of interest or directing somebody else to go there.