What you are seeing is the eventual effect of the changing topography of the lanes set in the 90's. Jeff Rigehl's has written a few articles about it. Even if the synthetic lanes themselves are breaking down evenly (doubtful) the underpinnings underneath haven't shifted even some in the last 15,20,25 years get real. The USBC's lack of enforcing at least semi annual checks on topography is a joke.
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