Something like this could be developed. For instance, the car could have an array of lights on its grill (think Knight Rider) that track in the direction of det

Something like this could be developed. For instance, the car could have an array of lights on its grill (think Knight Rider) that track in the direction of detected obstacles, if you don't see a light facing towards you then you know you are not detected and to use caution. Alternately a light on the front of the car could turn from yellow to blue to indicate its intent to yield.