What it does is placing a group of vehicles along a stretch of road next to a randomly selected markers (these are pre-placed as full randomization would give strange results). If so desired players are placed next to the convoy as well (done in a way that the markers in briefing are correct).
If you want to know all the inner workings you'll have to look into the scripts in ws_scripts; for now I'm not planning to do an extended documentation

There might also be some bugs left as well as irregularities that I considered to small to fix.
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