In the USA, they took the big orange hazard balls OFF the power lines because having them on was admitting they were dangerous, therefore if someone hit them and was injured or killed, the owner of the wires could be sued because they didn't do "enough" to make sure nobody hit them. Bloody lawyers.
Besides the difficulties involved in putting them up - like extra weight on the lines, and the fact that there are thousands of kilometres of wires all over the country that would have to done, would something like this make a difference to wire strike accident numbers?
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Edited to add that the comment in my first paragraph appears to be untrue, this was an old story that I heard a while ago and just regurgitated without checking. A little Googling has found quite the opposite, in fact the USA requires lines to be marked if they don't meet visibility guidelines. And here's a
link to a legal case where they won because the lines WEREN'T marked.
So ... why don't we do this in Australia?