[oh_sigh]

One problem I can see right off the bat is at the trees might rec a lot of the pavement (from roots uplifting the pavement).

Walking around parts of Portland on the sidewalk is like being on a rollercoaster because of the tree roots.

[onlyrealcuzzo]

Right, that's why you'd want to plant trees with specific types of roots that wouldn't cause this damage. But it's an important thing to consider.