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Not to discount your possibility, but interestingly enough it's possible there are bugs in the mapping data.

See http://testoptimal.com/ref/starwest-2006-mbt-tutorial.pdf, page 99 for a neat example.

It's sort of ironic, I remember reading a much more in-depth paper from Harry about this specific work, but I can't find it. :-/

It might be minimizing driving time, which would in fact give preference to right turns over left, since you often have to wait for left turns.

I remember seeing a paper that suggested outlawing all left turns except onto cul de secs or where at least one road is one way would shorten driving times for everyone. Every time I get stuck behind a huge long line of jerks trying to turn left I think of that and seethe.

i thought i suggested something new for them to patent :(