Final answer:
A police officer should be obeyed over a stop sign or a flashing red light as they have the authority to enforce laws and issue tickets.
Step-by-step explanation:
In terms of authority, a police officer should be obeyed over a stop sign or a flashing red light. A police officer is a legitimate source of authority and has the power to enforce laws and issue tickets for violations. A stop sign and a flashing red light are traffic control devices that serve to regulate traffic and ensure safety, but they do not have the same level of authority as a police officer. It is important to note that obeying traffic signals and signs is still necessary, even when a police officer is present.