The following road sign remains valid until:

- Until the nearest intersection or until an urban area entry sign.
- An “end of urban road” sign.
- Correct answer: A road sign that cancels it.
- Until the nearest intersection with traffic lights.
Why this is the answer
The correct answer in the official bank: A road sign that cancels it.
This sign does not stop applying by itself at the nearest intersection, at a signalised junction, or when entering or leaving an urban road. The restriction it sets stays in force along the road until a sign that explicitly cancels it appears. So keep obeying it even after intersections, until you see the cancelling sign.