BUT YOU ARE THAT STUPID

If you use the circular signals instead of the flashing yellow arrow signal
to decide when to go while turning left at a flashing yellow arrow traffic signal...
then you ARE that stupid.

The offenders say:
 
"If I don't understand the flashing yellow arrow signal, I can just look at the circular ones and obey them instead."

WRONG!!! THIS IS DANGEROUS!
 
THOSE ARE NOT YOUR SIGNALS!

flashing yellow with circular red

Flashing yellow and circular red together
 

ONCOMING TRAFFIC HAS GREEN IF yellow arrow IS FLASHING

It causes the yellow trap the flashing yellow arrows are supposed to prevent.

The flashing yellow arrow signal was invented to totally separate the timings of left-turn traffic from those of straight-ahead traffic.

The circular straight-ahead signals may be showing a totally different indication than the left turn signal is showing. For example, the circular signals may be showing red while the flashing yellow signal is still flashing. Or the circular signals might be green while the flashing yellow arrow signal is red.

If the circular signals are changing to yellow, but your flashing yellow arrow does not stop flashing, then you must continue to wait for a gap in oncoming traffic.

The left-turning driver must look at only the left turn signal, not the signals for other drivers.

WHENEVER THE YELLOW ARROW IS FLASHING, ONCOMING TRAFFIC HAS A GREEN!