This younger Ginkgo is approaching 20 years old and show what is typical branch attachments for these trees, broad and strong. These can greatly increase their diameter over time and several on this tree need removal before they come into conflict with the street or with pedestrians, the lowest here is only about 4′ up the trunk. This cultivar has closer and more regular branching than is common on seed grown plants, which can be quite gawky over a long youth period. I would remove some of these to reduce stress on the trunk.