https://legalbeagle.com/7454514-tree-maintenance-law-california.html
1. "Owners of property have the duty to maintain their land to prevent it from becoming a nuisance for neighboring property owners. "
Your tree is probably a nuisance if it damages other's driveway
2. "What does a landowner risk if they take an aggressive approach to trimming back encroaching tree branches or roots? Quite a lot in California.
For wrongful injury to a tree, the owner can receive three times the amount of the actual damages. "
Basically, they can't trim the root or cut down branches on their side of the property.
3. Solution is you offer to cut down the tree. They'll have to fix the driveway themselves.
