Which formation is used to block third-party traffic and assist in changing lanes on multi-lane roads?

• A. Diamond Formation
• B. Offset Formation
• C. Inverted T Formation
• D. Bounding Overwatch

Answer: (B)

On multi-lane roads, you need a formation that creates a protected corridor and prevents third-party traffic from squeezing into the convoy while still allowing orderly lane changes. The offset formation does this by placing vehicles offset across the width of the travel lanes, effectively creating a moving barrier that covers adjacent lanes. The lead vehicle maintains the line, while the follower sits offset to guard the neighboring lane, making it harder for other drivers to cut in and giving you room to maneuver. When a lane change is required, the offset setup provides a clear path: one vehicle can shift into the target lane while the others hold security, enabling a controlled transition rather than a risky, sudden merge. Other formations aren’t as well suited for this specific need: they either spread security too thin for fast road traffic, rely on moving in gaps rather than maintaining a steady blocking posture, or fix a chokepoint in a way that hinders smooth lane changes.