That's just the Phase I audio alert. It's no different from a car's collision avoidance sensors...if you ignore the blinking lights and loud buzzer, you're going to plow into the car in front of you all the same. It's not an adequate measure for preventing the kind of speeding and signal-blowing accidents that have been plaguing the Green Line. For that, you need real-deal automatic speed enforcement and stops. And that's not coming until Phase II of GLTPS, which doesn't have a schedule yet because it's significantly more complex an implementation. I don't think they should be patting themselves on the back too hard over Phase I. That can (will?) blow up in their faces pretty thoroughly if the Green Line has another high-profile operator error accident in the interregnum between Phase I and Phase II.