As shown in the picture, what should the driver pay attention to before entering the tunnel?

ANSWER · A, B, C, D

When driving safely, pay attention to both "the sky" and "the ground" - know the traffic situation around your vehicle to spot potential hazards in advance. Watch not only road conditions but also things above the road, such as direction signs, height/speed/width limit signs, etc. Especially when passing overpasses, culverts, and tunnels, pay close attention to traffic signs and overhead obstacles, and turn on headlights in advance.

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