Honey Locust Tree Sapping
They will "bleed" out a lot of sap after spring pruning, so that is probably what is happening, if they have been pruned or cut back this spring. Such bleeding of sap is totally harmless to the plant, although the falling sap can be messy. If no pruning has been done this spring, there may be other wounds or insect damage that led to the leaking of the sap. Such wounds could occur from borers, physical damage (getting hit by passing trucks, for example), hail damage, or woodpecker damage.