Final answer:
At a 4-way stop, if another car goes out of turn, yield to avoid a collision for safety. In emergencies, like with a pregnant woman about to deliver, deciding to break traffic rules like running a red light must be weighed against potential safety risks and legal implications.
Step-by-step explanation:
If you are at a 4-way stop and it is your turn to go, but the car across from you starts to go instead, the proper reaction would be to remain calm and yield to the other vehicle even though it is technically your turn. Safety should always be the top priority in such situations. By yielding, you avoid the risk of a collision and ensure that all drivers can proceed safely through the intersection. Once the other car has passed or it is clear they are fully committed to going despite it being your turn, you can then proceed if it is safe to do so.
In the case of the example involving a pregnant woman in labor, although it might seem necessary to go through a red light to get to the hospital quickly, it's crucial to consider both the legal implications and the safety risks of that action. Typically, it is only permissible for emergency vehicles to run red lights. If there are no other cars around and clear visibility, one might cautiously break this rule if the benefits significantly outweigh the risks. This determination, however, must be made very carefully, and it's often better to follow the rules of the road strictly for safety's sake.