Our track is marked for a 4 turn stagger ... we run this at our high school Invite ALL in lanes ... we have the extra markings though for the stagger and exchange zones.
For our track:
Start on RED line
Exchange 1 to 2 (WHITE Triangles; 200 meter mark; in lanes)
Exchange 2 to 3 (WHITE Triangles; 400 meter mark; in lanes)
Exchange 3 to 4 (YELLOW Triangles; 200 meter mark; in lanes)
We tried as well using a 3 turn stagger like traditional 4x400m and letting runners cut in ... the 3rd runner ... then line up the 4th runners like a 4x400m exchange all at the turn ... was bit scary due to speed of the incoming runners.
All in lanes is safest but the staggers are huge. It works though!