Takumi, I would actually presume the top is yellow, based on another Virginia example I used to drive under daily. On VA 134 (Armistead Ave) at the onramp to I-64 westbound in Hampton, VA was an almost identical setup, where the left turn lanes had three-lens signals (protected arrows only) and the two thru lanes had a green and yellow two-lens signal (I only ever saw it yellow once, when it was first installed the top lens flashed yellow). Unfortunately the two-lens signals were removed a few years ago, and are not even visible in street view anymore. They were added when Armistead Ave was widened through the area at least 10 years ago.