The points values assigned for traffic violations occurring in Maryland listed in the MD Driver's Handbook, does not specifically list "failure to obey traffic device."

Since this offense is not named in the list it would appear it would fall under the "any moving violation not listed and not contributing to an accident" which is a 1 point or under the title failure to stop a vehicle for a steady red traffic signal which is 2 points.

I would suggest checking on your citation to see what the code is that you were written up under. Then you can check the Maryland Driver's Handbook, 16-402 of the MD Annotated Code or with the Maryland Vehicle Administration to determine the amount of points this citation will place on your license.