...the 4 way intersection become "flashing red" on one side and "flashing amber", on the other. Which understood as a 4 way stop Signe inter-section by all drivers.
Sorry Mpoon, but it's considered a 4 way stop only when both directions get flashing red lights. When one dirction gets a flashing yellow, they have the right of way, but must proceed with caution. It's just a simple 2 way stop then.
I heard that these sensors are also having trouble sensing motorcycles (motorbike). A motorcycle is not large enough for the sensor a the light for the motorcycle stays red not knowing that there is an object waiting for the light to change.