Final answer:
A policeman must be obeyed over a stop sign, flashing red light, and steady red light, as they can make real-time assessments and give appropriate direct commands.
Step-by-step explanation:
Among a stop sign, a policeman, a flashing red light, and a steady red light, you must obey a policeman over the other three. In everyday life, citizens recognize the authority of police officers and comply with their directions during traffic stops and other interactions. Traffic control devices like stop signs and red lights are crucial for safety, but a policeman present on the scene can assess a situation in real-time and issue direct commands that might override usual traffic signals in certain cases, such as an emergency or road hazard. It's also important to note that traffic laws are in place to ensure safety. At times, unusual circumstances might compel someone to break a law, such as driving through a red light to reach a hospital in a life-threatening emergency. However, normally, the direct instructions of a police officer take precedence in traffic situations.