This is one of my favourite road signs. It is quite blunt but communicates the message in a memorable way.
In the Kimberley region of Western Australia there are not a lot of fences and the livestock are allowed to wander across the roads.
The balance of power shifts away from the motorist once there are pedestrians of this size. If I could put a collar on one of these guys and walk around Perth I bet more drivers would obey the law.
When I see think of the sign it reminds me of the blog title At War With The Motorist
I took the first photo on the highway near the town of Derby in 2002. I could not find the signs on my recent trip. It appears that they have been changed for a more conventional warning.