Paul Jackson wasn’t looking to be a hero as he drove down Interstate 5 last week. Among other errands, he was supposed to be picking up his wife’s birthday cake. Then he spotted a white SUV suddenly cutting across three lanes near Fife, Washington, and realized something was very wrong.

Inside the SUV, as KCPQ-TV reported, the driver was experiencing a medical emergency. Slumped over the wheel with her eyes rolled back, she was unconscious as the vehicle sped down the highway. In the back seat, strapped into a car seat, was her young son—wide awake and terrified. The........

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