On 05/16/2016 9:10 PM, philo wrote:
On 05/16/2016 08:38 PM, Dean Hoffman wrote:


I ran across this while looking for a vehicle barrier gate for our
farm.
http://www.qcsupply.com/50008-drive-thru-electric-gate-adj-13-19.html
My parents' neighbors had this version:
http://www.grahamindustries.ca/wp-content/uploads/2010/10/CattleGuard.jpg

People always called it a cattle guard. I have no idea if it would work
for other livestock.




Out west, they'd put closely spaced RR tracks in the ground spaced in
such a way that the cattle's hoofs would get caught or at any rate made
it too difficult to cross.

It worked so well that in some places, all they had to do was paint the
lines on the road and the cattle would keep away

RR rail has the advantage of being stout enough to hold any large
equipment albeit the weight makes it a pita when constructing...most any
I've seen are thick-wall tubing/pipe.

All that is really needed for the concept to work is enough of an
illusion that there's a hole/depression between the rails--they're
afraid by instinct of getting hoof caught in such a crevice so will not
venture onto the surface--hence they stay on the right side of the fence.

There doesn't need to be any "conditioning" with an actual device for
the deception to work; it relies solely on the visual effect. (Hence,
occasionally snow is a deterrent; it covers up such and is thus rendered
ineffective. The saving grace there is that once have been in a given
location for a while they tend to gravitate to and stay in particular
areas so it may never be tested.

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