Move across lanes when there is a suitable gap in the traffic - this means you may have to do it a long way from the intersection. A helmet or glasses mounted mirror is a great help when watching for a gap in the traffic. When in the LH lane I would have stayed in the middle of the lane until I got to the traffic lights, to avoid being left-hooked by a car turning at the lights, then move over to the middle of the road as I passed the lights.