The race to build autonomous war robots faces a problem that self-driving cars don't. There are no rules of the road.

War robots have to be able to function in environments without proper roads or rules, but with plenty of chaos. Andrew Kravchenko/Bloomberg via Getty Images

Militaries are increasingly using ground robots, and manufacturers want to make them more autonomous.

But battlefields present challenges that self-driving cars don't face.

There are no reliable roads or traffic rules, and battlefield conditions constantly change.

War robots are becoming a growing presence on modern battlefields, and defense manufacturers are pushing to make them more autonomous to further reduce the risks to soldiers .

But making uncrewed ground vehicles that can drive…

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