Depends somewhat on lane width - I will generally leave just enough room on my right for a right turning car to turn right - that may place me in the center of the lane, or towards the left side of the lane. I have one intersection on my commute which is a bit strange (northbound monroe, at El Camino Real in Santa Clara, CA) the road is marked as two lanes with a dedicated LTO lane (one lane in each direction plus the LTO), but it widens out at the intersection so that the total width, curb to curb is approximately 80' (look at the satellite view on google maps - there is a 60' articulated bus on ECR to the west of the intersection for scale). In this intersection I tend to position myself about in the middle of the lane, which still leaves plenty of room for a car on each side of me.

I need a car on my left to trip the detector for the light