WHBM.. The zig-zag is to permit traffic to be sequenced into the "circuit". A similar procedure exists off BIG to the south. When things are quiet LAM traffic can leave the VOR on a SW track for a straight-in on westerlies. On easterlies traffic which would be going round in the hold on westerlies can be on the downwind leg for the 09s. Track distances from LAM are around 35+ miles on westerlies and 50+ miles on easterlies but there is more room on easterlies to have more off LAM all at the same FL and 3nm apart.