Invasive roots from neighboring tree

[Durian Fiend]

Thanks for the responses, V1V and Durian,

Poisoning the tree would be simple enough, but when it eventually comes down, humongous branch at a time, and then the main trunk, three structures as well as the road would likely be affected. Including, possibly, lives. Can’t be the cause of that…

Cheers,
Kirt

But in that case, the dead tree basically forces the hand of the affected structures to deal with it.  Isn't that the ultimate goal?  

After all, it's their responsibility.  There's no way it will stop sending roots your way while still alive.