Final answer:
When facing a yellow traffic light, continue through the intersection if close enough and it's safe, but stop if you can do so safely. In emergencies with medical necessity, such as a childbirth en route to the hospital, carefully proceeding through a red light may be considered. Traffic signals are vital for safety and reducing accidents.
Step-by-step explanation:
If it is dangerous to suddenly stop when a light has turned from green to yellow, the safest and most appropriate action to take would be to continue through the intersection, provided you are already near enough and it is safe to complete the crossing before it turns red. If you can safely stop before entering the intersection, that is also an appropriate response. In the given scenario of a pregnant woman in the vehicle on the verge of delivering a baby at 4 am with the hospital 2 miles away and no other cars around, one may argue that in the interest of urgent medical necessity, proceeding carefully through the red light after stopping and ensuring no other vehicles are coming could be justified considering the emergency situation. However, under normal driving conditions, always adhere to traffic signals to prevent accidents. This principle of prioritizing safety for all is why the installation of traffic signals is critical in busy intersections, as it helps manage pedestrian safety and reduce accidents.