Final answer:
The maximum speed limit set by New Jersey law for certain state highways and all interstates is 65 mph.
Step-by-step explanation:
The law in New Jersey sets the maximum speed limit for certain state highways and all interstates at 65 mph. This is the answer to your question, and the correct option is (a) 65 mph. The speed limit is critical for ensuring road safety and must be adhered to by all drivers. It's also important to note that while highways may have this speed set as a maximum, local conditions or specific road sections might warrant a lower speed limit.