ABS designed for use on bitumen is less effective on gravel, but some ABS (don't know which ones) are designed to do better on gravel. Of course, experience on gravel (as on slippery bitumen) will show that stopping is going to take a lot longer anyway, so you had better drive accordingly.
As pointed out above, even if ABS increases the stopping distance on gravel, it at least lets you steer - which will help to avoid some accidents anyway.
John




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