虚线掉头功能的实现，除了planning模块增加掉头场景，routing模块是不是也得修改支持才行

[huboyan]

[daohu527]

Yes, it depends on how you implement it. If two roads are not connected, routing will fail. Therefore, you need to route to the turnaround point first, and then from the turnaround point to the destination.