I need so much help answering this question

Local law defines the speed limit as 45 miles per hour on local roads. The law outlines punishments by charging fines for those who drive faster than the speed limit.

Signs post this law on most roads. Local police stop a man traveling 67 miles per hour. He apologizes and says he did not see a speed limit sign. The officer gave him a ticket and told him he will have to appear in court since he was going so fast.

Is this a matter of constitutional, criminal, civil, or military law?