Yield sign for own right-turn lane?

Question Details: There is a roadway intersection where the right lane of a fwy frontage rd comes to a channelized right turn with a yield sign. The right turn leads into its own right lane (no traffic lane coming from the left of the intersection). The right-turn lane itself adds another traffic lane to the intersecting roadway. If a driver making the right turn proceeds because the right lane is clear, and immediately another vehicle on the intersecting roadway (w/ a green light) strikes him because that vehicle is making a lane change to the right lane, who is at fault?

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