Traffic signals and markings1 of 2
Under Maryland law, when are drivers legally permitted to disobey a standard traffic control device?
The answer
Answer: A. According to the Maryland Driver's Manual, everyone must obey traffic control devices. The only time you are permitted to disregard a traffic signal or sign is when directed to do something different by a police officer, other emergency personnel, or a uniformed school crossing guard directing traffic near a school.
Source: Maryland Driver's Manual (DL-002) — Section 4: Signs, Signals and Markings, p. 17