I have an intersection on my ride where about 80% of the traffic turns right, but I go straight. I always take a far left position, just to the right of the center line, at the stoplight. This allows people to turn right. At most intersections I'll be more centered, but never too far to the right because that invites people to pull around you then turn right in front of you.
If people use their turn signals I'll scootch over if I can. If they pull up behind me and have no turn signal on I assume they're going straight, and I'll maintain the center of the lane until I get through the intersection then usually move to the right tire track (depending on conditions and traffic).
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Work: the 8 hours that separates bike rides.