When approaching an intersection where you intend to make a left turn, you might be reluctant to move out into the lane to “take the road”, especially if you see a string of cars coming up from behind.
When this happens you can find yourself somewhat “boxed in”.  The motorists may not know what your intentions are because you are not positioned to turn left.  A motorist who wants to turn right may cross in front of you - not good!
To avoid getting in this situation, slow down well ahead of the intersection and watch for your opportunity when there is a break in the traffic to move over to the left-center of the lane.  Signal your intentions to turn left by extending your left arm.   Cars turning right can now safely move around you to the right.   It is also helpful to have an experienced rider in the back of the group who can more over and signal the left turn intention.