"AI_Hand" (Ver.1.1)

This object is placed under "AI_Core" in AI tanks, and is used for detecting an obstacle in front of the tank.
You can see this object as a translucent box in front of the AI tank.
When this object touches something, the AI stops the tank and tries to find a new path to the destination.

(Note.)
"AI_Hand" cannot detect an object without rigidbody.
When you want to place a barricade on the NavMesh, attach a rigidbody into it, and enable the "Is Kinimatic" option.