What must you do when approaching a railroad crossing?

Answer: B — Slow down, look both ways, and proceed only if safe

When approaching a railroad crossing, it is essential to slow down, look both ways, and proceed only if it is safe to do so. This practice is crucial for ensuring the safety of all roadway users since trains can approach quickly and are often not visible until they are very close. Slowing down allows drivers to better assess the situation, including checking for any incoming trains. Looking both ways helps to confirm that the tracks are clear of any oncoming trains and that no warning signals are engaged. Proceeding only when it is safe ensures that drivers do not take unnecessary risks that could lead to dangerous collisions with trains. This careful approach aligns with many regulations and safety guidelines surrounding railroad crossings aimed at preventing accidents and protecting lives.