When driving on an expressway in dense fog, heavy rain, or blizzards with visibility LESS THAN 50 METERS, what are the driver's statutory obligations?

1. Speed up to 80 km/h to pass through the fog bank as quickly as possible
2. Turn on fog lights, low beams, clearance lights, and hazard warning flashers; reduce speed to not exceeding 20 km/h; and exit the expressway at the nearest ramp immediately
3. Stop in the left overtaking lane and wait for fog to disperse
4. Maintain daytime speed while honking the horn continuously