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425. Which of the following is not true about icy roads during winter months?
- Icy roads are more common on concrete roads than on asphalt.
- Ice melts slower on asphalt roads than on concrete.
- The friction coefficient of an asphalt surface increases to 1.6 when dry.
- Under the same conditions, the road friction coefficients of frozen concrete and asphalt surfaces are equal.
Answer : 3