Usage patterns
〈事〉の分岐点になるto become a turning point for something
That decision became a turning point in his life.
〈場所〉の分岐点を過ぎるto pass a fork or junction (of a road, path, etc.)
After passing the fork in the mountain path, the scenery changed.
分岐点に立つto stand at a crossroads (facing an important choice)
The company is now standing at a major crossroads.
分岐点を迎えるto reach a turning point
The research finally reached a turning point.