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The Mishna states: If a tree is leaning over the public domain, it must be cut so that a camel and its rider may pass by.
HaGaon Rav Yosef Shalom Elyashiv rules in reference to our Mishna demanding a tree’s owner to prune its branches that disturb public traffic that he is only required to cut branches up to the height of a camel with its rider. The current obligatory limit, however, is the minimal height demanded by government authorities for building bridges over roads.