What does this picture mean?

be aware of large trucks on the roadway
use truck rules and regulations while driving on the road
only trucks are allowed on the roadway
no trucks can use this roadway

Option (a) is the correct answer.

Explanation:

The given sign in the picture is a large image and usually these signs are used on roads in order to alert people that trucks are also passing through so everyone must drive carefully in order to avoid any accident.

These signs are basically caution symbols framed for the safety of people.

Whereas a sign with no trucks on this roadway will have a cross sign on the picture of a truck.

Thus, we can conclude that the given picture mean that be aware of large trucks on the roadway.

the answer would most likely be c, because if it's a comical piece of information, it may likely not be true, if it's a site that allows anybody to edit the content, it could mean a five year old is typing the info, and if it's a tv show produced by a celeb, it may have a biased opinion.