What does the manual say about using snow tires or chains on winter roads?
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A.
Together they allow you to drive at normal posted speeds.
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B.
Neither allows you to drive on bad roads at normal speeds. Correct
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C.
Chains alone allow normal speeds; snow tires do not.
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D.
Snow tires increase safety on ice while chains give extra traction.
The answer is "Neither allows you to drive on bad roads at normal speeds."
Snow tires and chains both help, but neither restores normal-speed handling on bad winter roads. Choice A restates the driving-culture belief that stacking winter equipment adds up to full winter capability, which the manual denies in the same sentence that names both.
The traps in the wrong answers
A. Together they allow you to drive at normal posted speeds.
The manual explicitly denies that combining the two restores normal-speed driving. This answer follows the rule of thumb that stacking winter equipment adds up to full winter capability.
C. Chains alone allow normal speeds; snow tires do not.
The manual denies that chains restore normal-speed handling on bad roads. This answer ranks chains above snow tires on the assumption that heavier winter gear removes the speed restriction.
D. Snow tires increase safety on ice while chains give extra traction.
The manual pairs snow tires with extra traction and chains with safety on snow or ice covered roads, not the reverse. This answer applies the intuitive picture that metal chains bite for grip while rubber snow tires provide overall safety, reversing the manual's pairing.
This question tests your knowledge of Adverse Conditions in Illinois. Source: Illinois Rules of the Road, "Weather Conditions, Winter Driving," p.85..
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