Where must you be prepared to encounter sudden fog?

You answered correctly because fog often forms in areas where moisture is abundant and temperature changes quickly. Near rivers, marshy areas, and lakes, the high humidity and cooler temperatures can cause water vapor to condense into fog, sometimes quite suddenly. This means in these locations, drivers should be especially alert and prepared to reduce speed or use fog lights, as visibility can drop rapidly. Understanding these natural conditions helps you anticipate fog hazards and drive more safely in these environments.