What should you do when you see a road sign indicating a tunnel ahead?

When you see a road sign indicating a tunnel ahead, preparing to decrease your speed is the appropriate action. Tunnels can present various challenges, such as reduced visibility, changes in traffic flow, and potentially different road conditions inside the tunnel compared to the surrounding area. Lowering your speed allows for better control of your vehicle and ensures you can react appropriately to any potential hazards, such as sudden stops or traffic congestion within the tunnel.

In addition, it’s common for tunnels to have speed limits that differ from other roads, so being prepared to adjust your speed is essential for safety. Other options may not address the critical need to navigate the tunnel safely. For instance, accelerating could increase the risk of losing control or crashing, while switching to full headlights may not be necessary in all tunnels, depending on their lighting conditions. Seeking alternate routes is impractical unless there is a specific reason to avoid the tunnel, such as road closures or severe accidents.