Which formation is used to block third-party traffic and aid in changing lanes?

• A. Bounding Overwatch
• B. Offset Formation
• C. Herringbone Formation
• D. Traveling Overwatch

Answer: (B)

Offset Formation is used when you need to hold a road and constrain other traffic while you set up a lane change. By placing vehicles slightly off-center in the travel lane, you create a barrier that blocks third‑party traffic from trying to squeeze between units and you establish a clear corridor for the lead element to shift lanes or merge safely. The rest of the formation stays ready to maintain security and respond if traffic pushes or if the path becomes threatened. This setup is especially useful during convoy movements where controlling civilian or other vehicles while reconfiguring lanes is essential.

Other formations focus more on security during movement rather than creating a controlled blocking corridor for lane changes. Bounding Overwatch and Traveling Overwatch emphasize keeping security while one element advances or maintains a watch, rather than shaping the traffic flow for an orderly lane change. Herringbone, on the other hand, is a road-block pattern that blocks traffic across the road, not a flexible formation designed to facilitate lane changes.