Practice ,Practice, Practice
Ride safe, use your mirrors, and pay attention.
I believe I was in one of these formations one time in the Spring of 05 with a great riding friend Chess.
We had just survived a close call with a tractor trailer and a Construction Zone, quick reactions and excellent riding skills saved us both.
About 6 or 7 miles later about a hundred bike "M/C" entered the highway we were on and we melded in and had safety in numbers and skill, until we reached our exit.
It was quite exhilarating and felt very reassuring after the close call we had.
This picture was taken about an hr before the close call.