[Tagging] What is this called?

[John Smith]

We've been trying to figure out what to call these things...

http://townandcountryfences.com.au/uploads/images/21032009008.jpg

The original person asking suggested "cavaletti", but when I went
searching the only thing coming up were temporary horse jumps, not
these kinds of barriers.

I have seen them referred to as horse stiles by Aussie, UK and NZ
websites and horse hops by US sites.

You can see them in use here:

http://www.nearmap.com/?ll=-37.958364,145.26343&z=22&t=h&nmd=20100416
and here http://www.nearmap.com/?ll=-37.965911,145.262016&z=22&t=h&nmd=20100416

Apart from trying to prevent riderless horses crossing these barriers
they are also used to stop motorcyclists.