The "flow of green" thing doesn't work for a couple reasons. One, imagine one driver doing the speed limit catching every green light. Now imagine, 2 blocks back, there's another car doing the speed limit, but they're catching reds because they're behind the target car. So they are now incentivised to speed to catch up to the car that is reaping the benefit, so they too, can reap the benefit.

What….?

If you’re stopped at one red light, all the others will be timed to be green when you get to the next. If you speed from the red, you’ll only hit the next red. You seem to not comprehend how the system works.

These systems have been around for decades already.

The downside is if you’re traveling against the traffic (like leaving downtown in the morning), you’ll hit every light.