This field is the single highest per-interval delta value on the live, currently-updating stats object for late collisions detected on this interface — collisions that occurred after the first 64 bytes of a frame had already gone out — the worst burst seen across the retained collection history. This is the number to check after an alert fires, since it shows the worst single interval for lateCollision on this interface even if the current live value has already settled back down. For example, a recorded max of 19 late collisions in one interval would flag the worst burst the interface has seen, useful for correlating against a specific outage window.