Your C truck's speed limiter is set to the fitted maximum. A variable motorway signal over your lane shows 70 km/h. What speed may you use?

1. At most 70 km/h; the limiter does not authorise exceeding a lower posted or signalled limit
2. The limiter setting, because it is a legal ceiling and a permission
3. 90 km/h, the general motorway truck maximum
4. Any speed if traffic is light