Answer:
The word opprobrium most likely means "criticism". A word that is a synonym for opprobrium is "disapproval".
Step-by-step explanation:
Opprobrium means harsh criticism or, depending on the context, shame, discredit, dishonor.. Even if we did not know the word's meaning, we could conclude what it is by taking the whole sentence into consideration.
The sentence talks of people reacting badly -disapproving- new regulations. Then, it claims that no other law has had such a bad reaction as the one for raising the driving age. We can assume opprobrium still refers to disapproving, to a reaction of criticism. As a matter of fact, the word opprobrium is being used as a fancy way to avoid the repetition of "disapproval" in the sentence. We can, therefore, safely say that opprobrium means "criticism" and that "disapproval" is its synonym.