that is true but imagine that car makers would agree on a standard for one second (i know it will most likely never happen) but at that point they can actually donate those to make the streets work wherever they want to.

This also totally does not solve the problem of object detection of the car but its another assist. Like you yourself are driving too: with context.

I (the car) am on a redisdential road, my speed is automatically limited and am in "high awareness" mode.

I (the car) am on the autobahn, I opt my sensors for distance. "ping" oh i will enter a construction site in 1km, i better notify my driver that this could get ugly and that he should be able to take over any second now.