Question

you are driving on a highway and are approaching a construction zone;
select a letter to choose your answer.
a you must slow to 45 miles per hour.
b the proper speed for the construction zone will be posted on speed limit signs and warning signs in the construction zone.
c you should drive 20 miles per hour below the standard speed limit for that highway.
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Explanation:

Construction zone speed limits are not a universal fixed number or a fixed reduction from the highway limit; instead, the specific required speed is always posted on official signs within or approaching the construction zone to match the site's unique conditions.

Answer:

B. The proper speed for the construction zone will be posted on speed limit signs and warning signs in the construction zone.