What does a flashing amber arrow pointing left at a traffic light mean?

A driver may turn left but yield to traffic on the other road.
A driver must not proceed in this direction.
A driver may proceed before traffic on the other road.
The driver must wait until the traffic lights turn green.

Explantion: A flashing left amber arrow at a junction means you may proceed left but must give way to pedestrians and traffic already coming through the junction on the other road.

Theory Tester

What does a flashing amber arrow pointing left at a traffic light mean?

Legal Matters/Rules of the Road