dig out your ticket and then go to
Traffic Citation Information
follow the instructions to see how much your fine is and if points are involved. from what i can see the fine is $530 and no points, but then i'm only working off the idea that you got one ticket only. if you still have questions, call the court clerk, they are a great resource without having to pay a lawyer
and no maryland did not "makes these laws and then basically hide them".
Truckers Map is the free truckers map available online, it took me @ 2 minutes to find and download. it clearly states that it is a restricted route. look in box 4.