[the8472]

Some trees root more deeply than spreading out horizontally. Simply leaving more room around the green strip helps too.

Brickwork sidewalk might bend a bit more smoothly than asphalt or concrete slabs... or at least it should be more repairable without tearing everything out.

> Also on some pavements the trees cause bottlenecks because its too narrow for two people to pass eachother.

This indicates that there's simply too little space allocated to the sidewalk + trees.