We have them here on logging trucks, sometimes, but as a last ditch effort to save the bacon of the driver driving way too fast for the load. I've followed one tanker that was misting my windshield on the 80 to Sacto outside of Colfax until I passed it.
The only issue with retarders is that they require prediction not reaction. Once you've oversped on downhill, it's too late. Typical driver would fail the prediction.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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