There are three lanes, with the left two lanes narrowing into one. A slight bit further ahead, the traffic from Gallows Road merges into the right lane, map here.
Many people from the far left lane merge “unethically,” driving ahead as far as they can, and then asking to be let in at the near-front of the queue. The traffic from Gallows Road, coming on the right, merges ethically, as it is a simple feed of two lanes nto one. They have no choice as to when the merge is, although de facto the construction of the intersection puts many of them ahead of the Rt.50 drivers.
The left lane merge is slightly quicker than the right lane merge, in part because not everyone is an unethical merger. Yet it is more irksome to drive in the left lane, because you feel, correctly, that people are taking advantage of you (unless you are an unethical merger yourself, which I am not).
In recent times, I have switched my choice to the right lane.