When driving an urban taxi at night on a well-illuminated city street, which vehicle lights should the driver use?

1. High-beam headlights (远光灯) to maximize visibility
2. Low-beam headlights (近光灯), clearance lights, and license plate lights; never use high beams on lit urban streets
3. Only hazard warning flashers without headlights
4. Keep all lights turned off to conserve vehicle battery