Besides the obvious site of a falling tree or an old rotting tree, there’re plenty situations we walk into where tree simply cannot be safe. In many cases we see trees are leaning way too far to the left too to the right. We’ve seen trees that have been infested with animals and insects along with a hollowed out core.
In situations like this, it’s rare that we are able to save the tree. As badly as we want to, the people that live around or reside near the tree are at risk. When this becomes a remote possibility, something needs to be done about your tree.
There are sophisticated cabling & bracing systems that we can talk about, but those are usually setup in preventative manners for older trees that have a weaker structural integrity than most.