• Preparing for a left turn or left exit.
• Passing a slow-moving vehicle.
• Changing to a safer lane.

How:

1. The ride leader gives the proper signal.Everyone passes back the signal and HOLDS position.
2. When safe, the sweep rider will pull over into the target lane and protect the lane.
3. As the last car clears through, the ride leader changes lanes and signals others (sweeping signal to the left or right).
4. Following the bike in front, each successive bike moves into the new lane.
5. Don’t jump the change!
6. If protecting the lane might cause a traffic hazard, pass when it is safe.

This is from the National HOG website. I encourage you to check out whats online at http://members.hog.com