The signal on the left alternates in color. The signal on the right blinks on and off. Let your eyes drift away from the image while you read this text: notice you will still see the blinking. But the one on the left has become a single bright dot without much signaling.
The LED turn signals on some of the new Mercedes cars work like the dot on the left. The yellow LEDs are in the same space as the white LEDs. When the yellows blink there is only a contrast in color. Less stylish, old fashioned turn signals are in a different position from the white lights. This creates a contrast in brightness..
I wonder if style won over safety here?