At a road-work site, a temporary speed sign shows 40 km/h but the permanent sign behind it shows 80 km/h. What should the driver do?

1. Follow 80 km/h because permanent signs always win
2. Follow 40 km/h while the temporary work-zone control applies
3. Average the two speeds and drive 60 km/h
4. Ignore both signs and use the ordinary outside-settlement limit