Many of the left-turners screw bikers not because we are invisible (despite the "I didn't see you" refrain), but because they cannot gauge how fast we are traveling in the same way they can with a car. Cars obviously are larger, and that makes it easier to keep them in perspective (i.e., they get bigger as they close). But size is not the only component. The oncoming lateral shape is the biggest indicator of closing speed. So the headlights (at night) or the cage edges are the best clue of whether that oncoming vehicle will intercept your left turn. Bikes don't offer the same profile, and at night, they present a single point of light.
Split that light into two (or put some running lights on the sides) and the driver has a lot more information to work with.
HTH



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