Final answer:
The statement that you must yield or stop if unable to merge safely into traffic is true. Yielding ensures road safety and may include halting until it is safe to merge. Emergency situations, such as rushing a woman in labor to the hospital, may present moral dilemmas where rule-breaking is considered against typical legal advice.
Step-by-step explanation:
True: The statement 'Yield also means stop if you cannot merge safely into the flow of traffic' is indeed true. Yielding in traffic terms means that you must give way to other vehicles and wait for a safe opportunity to enter or cross the roadway. The action of yielding includes stopping if necessary to allow traffic to pass before merging safely. It is important for promoting safety on the roads and preventing collisions.
In emergency situations, such as a pregnant woman in the backseat nearing labor at 4 AM and no other traffic around, an argument could be made under Rule Utilitarianism (RU) principles that it would produce more overall utility to carefully proceed through a red light to get to the hospital. However, this is conditional and typically against traffic laws, so it should not be considered the norm.
Moreover, the presence of traffic signals at intersections functions to slow down vehicles and enforce safer speeds, as vehicles cannot speed through these signals without facing potential legal consequences.