[dmix]

I'd imagine the highway doesn't normally have a debris that's nearly the same color of the surface of a highway.

[JohnFen]

I encounter such things a few times a year. Usually a retread that has come off a truck tire.

[cozzyd]

The highway often has debris on it at night which can be even harder to see

[rainsford]

The meatbags riding in front saw the debris about 800 feet away if my napkin math is right. Uncommon occurrence or not, a computer not seeing it ever seems like an unacceptable performance standard.

[cosmicgadget]

I wonder if a non-visual sensor could make the distinction.