As the street trees are growing, cut (prun) the branches and leaves.

Street trees are pruned about once every multiple years depending on the type of tree for the purpose of healthy growth of trees.
In addition, if the branches cross the border of an adjacent private house, if the branches and leaves are too thick to hide traffic lights or signs, or if the branches and leaves protrude low on the sidewalk or roadway, give priority. I'm cutting branches.
Please contact Public Works Office in the district.

※In addition, about street tree of national highway, please refer to each branch office (depending on place) of Yokohama National Highway Office.

Public Works Office, each district

Yokohama National Highway Office (outside site)