re: What are the rules for running red light on a continuing left?

I don't know about the law, but up here the trend has been a move to a flashing yellow arrow. You still get s solid green, but when it ends, the arrow goes ro flashing yellow which lets you turn left when clear.

ETA: Of course this is just for when the cross traffic has the red. You don't have the light when they have the green. shite, explaing traffic in just words is hard.