Great couple of posts on Traffic Signals, yet the perspecptives on signal timing are about more than 10 years old from the Portland viewpoint. We've had transit priority since 1999 and the signals never leave coordination. LRT preemption isn't terribly novel and the staff in Portland are continuing to work with our software vendors on ways to make it more effective.
The article that inspired this are here:
Fighting Congestion in Minneapolis on a Tight Budget
It's not about fighting congestion, it's about taking a look at the policy and determining the best solution given the desired outcomes. Do you want people to take bus, should transit be a competitive mode, if so, manage congestion, don't fight it is a philosophy that has been employed in Portland.