Traffic lights in construction sites

Transportation, Travel and Trips
1
Hi,

It is known that for a "normal" traffic light, you are expected to clear the whole intersection before it gets red (+ 0.5 seconds tolerance?). What about traffic lights set up in a street that has temporarily become partially one-sided for construction? The one-sided stretch may span a few hundred metres. Are we still (at least technically) expected to leave the whole stretch before the traffic behind us becomes red?

Thanks

2
I believe construction lights have a short period when both red lights are on to allow the traffic to clear.

And most of them around here are flashing yellow, not green (oops).

3
They have red and flashing yellow here but not green. Flashing amber means go as long as it is clear to do so.

There is definitely a time during which both sides are red to allow time for the traffic in one direction to clear before letting the other direction go.