Siri wants to kill us?
By default, Siri does respond to questions while driving--instead of drivers' eyes on the road while Siri searches for answers, Apple would rather we pick up our phones to do the search ourselves? Is there a FIX for this?
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It's probably best to focus only on driving. But, All you need do is say "Hey Siri," to activate Siri while driving.
What can I ask Siri? - Official Apple Support