Last week was a difficult one for Tesla. After the carmaker waged a public war of words with federal safety regulators, CEO Elon Musk picked a Twitter fight with a magazine and may have improperly revealed financial information.

But wait. The auctioneer stopped the bidding when he noticed the price on the screen was wrong. ...

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The would-be rules don’t change how long drivers can stay on the road—still limited to 14 hours on duty, with at most 11...

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