What is advised when approaching a hump-back bridge?

Answer: B — Slow down

When approaching a hump-back bridge, it is advised to slow down to ensure safety. Hump-back bridges can often impede visibility, making it difficult for drivers to see oncoming traffic, pedestrians, or any obstacles that may be on or near the bridge. By reducing speed, drivers provide themselves with more time to react to unforeseen circumstances, which can help prevent accidents. Additionally, slowing down allows for better control of the vehicle when navigating over the bridge's elevation. It's also important to be cautious, as other vehicles may be approaching from the opposite direction. Maintaining a lower speed can help in negotiating any potential curves or changes in road conditions that may be present before or after the bridge. In this context, accelerating could increase the risk of losing control, while changing lanes may not be necessary or safe given that visibility is limited. Sounding the horn is generally used as a warning signal but is not a substitute for adjusting speed and maintaining control. Thus, slowing down is the most prudent approach when dealing with such structures.