How control truck rout in the yard zone?

The rout in yard zone is rectangle. And sometimes the default rout of trucks is not what I want.

So, I must program in the network node to make trucks choose right routs. But there are so many nodes, it is diffcult to debug.

Are there any other ways to choose correct routs?

Trucks will travel in the shortest possible path through the network. You can control where they travel easiest by using one way paths in places that disallow travel in certain directions.

For more information on how to configure your network to get the trucks to behave as you desire, you can also refer to the documentation about the networks in the CT Help > Miscellaneous > Networks.

Thank you phil.
But I cannot disallow certain directions because trucks would travel every direction according different conditions.

My current solution is:
in the node's onArrive trigger, I return different values according different conditions.

But there are so many nodes, sometimes I cannot tell which nodes have not been programmed. So, I wonder if there is a more convenient way to do it.
(I read the mannual)