When approaching the entrance of a highway tunnel during bright daylight, what actions should the driver take before entering?

1. Speed up to pass through before vision dims
2. Turn on low-beam headlights in advance, remove sunglasses, reduce speed, and adapt to the sudden change in light levels ('black hole effect' / 黑洞效应)
3. Activate high beams and sound horn continuously inside the tunnel
4. Close eyes for two seconds to pre-adapt retinas to the dark