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Question:

Which of the following is true about road work zones?

A In work zones, you must observe posted speed limits. Slow down and use caution.
Explaination

In work or construction zones, reduce speed and proceed with caution. Always obey the posted speed limit. If no speed limit is posted, you may drive no faster than 45 mph if workers are present. [Speed Limits, Chapter 3 Traffic Laws and Vehicle Operation, Minnesota Driver's Manual]