I get what you're saying — so it's about the subconscious awareness of the state change that happens after the driver decided to go, but before the car starts moving. I can see some amount of value in that.
I still can't help but think it's going to be interpreted by many as a sign that it's safe to proceed and ignore the car rather than be prepared for any eventuality, though.
But isn't that exactly the situation we're in now? If there's a car in the opposing left turn lane, they might start to turn in front of you.
The only thing the light does is say "right now, they're braking". It doesn't say whether they're moving or stationary any more than the headlights, and it doesn't say anything about their intentions or whether it's safe to enter the intersection.
Yeah, the only thing I could think of is that I'm driving down a country road, and I see the front brake light ahead of me because someone stopped for a deer in the road or something.
Otherwise I cannot fathom what benefit it brings. Anything that ultimately becomes "if you see this light, it's safe to [X] in front of this vehicle" is going to get people killed.
And the negative state of "the lack of this light means that the vehicle could be moving" is exactly what we have now.
I get what you're saying — so it's about the subconscious awareness of the state change that happens after the driver decided to go, but before the car starts moving. I can see some amount of value in that.
I still can't help but think it's going to be interpreted by many as a sign that it's safe to proceed and ignore the car rather than be prepared for any eventuality, though.