Speech-to-text, rated at 3.06, was distracting enough in error-free lab conditions and rated 4 or higher in regular driving conditions. The problem is how error-prone speech-enabled texting can be. Driver anxiety and distraction shot up when they corrected—and driving became secondary.

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Sadly, speech recognition costs almost as much mental energy as texting by hand it seems. No wonder we continue to handle the device by hand.