driving,
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, too.
The model suggests that a person operating a piece of equipment seldom has an accident, thanks to layers of protection reducing the odds of that happening. Reason portrayed each layer as a slice of indestructible cheese standing between the individual and disaster. “In an ideal world,” he wrote in BMJ in 2000, “each defensive layer would be intact. In reality, however,
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, they are more like slices of Swiss cheese.” When holes in different slices align,
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, a situation becomes hazardous.
In driving, keen attention is often the protective slice that enables the driver to swerve out of harm’s way. But that’s the very slice that is degraded by distractions. Other intact layers might allow a driver to escape harm, such as scant traffic on the road. “An impaired driver may get home without crashing,
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,” Strayer says. Most usually do.
But the safety of a distracted trip hinges on factors out of the driver’s control. The roads might be wet. Traffic could be heavy. There’s drowsiness,
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, road construction,
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, darkness,
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, a novice driver in the oncoming lane. Sometimes there are lots of holes in the cheese. “You need to be able to react,” Strayer says,
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, “because you never know when the other holes will line up.”
Safety versus freedom
Sometime in the future, driving and cell phones may get a divorce. “We might actually look back and say, ‘Well that was really stupid,’ ” Strayer says. “But I don’t know if that’s going to happen.”
Coben favors a strict ban on phone calls while driving but anticipates resistance

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