Red bars in motorway works

NewEdition

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My boy asked me this and I dont know the answer...
The big red n-shaped bars, about 5 metres high that seem to be set in barrels. What are they for?
Any ideas?
 
Yep, to warn machinery. They are set just before overhead cables and a little lower. If machinery passes safely under the barrier, they'll have no problems with the cables.
 
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