2-26. Movement control is the dual process of committing allocated transportation assets and regulating movements according to command priorities to synchronize distribution flow over lines of communications to sustain land forces (ADP 4-0). Units transiting another unit’s AO are required to coordinate with that unit’s headquarters. Generally, the unit assigned an AO controls movement within that AO. The designation, maintenance, route security, and control of movement along routes within an AO are the responsibility of the owning unit unless the higher echelon coordinating instructions directs otherwise. The commander of an AO may designate movement routes as open, supervised, dispatch, reserved, or prohibited. Each route’s designation varies based on the mission variables. (See ATP 4-16 for a discussion of movement planning and control measures.)