The following road sign remains valid until:

- Until the nearest intersection or until an urban area entry sign.
- An “end of urban road” sign.
- A road sign that cancels it.· Correct answer
- Until the nearest intersection with traffic lights.

Sign 418 marks an area prohibited for driving instruction. The sign's validity continues until sign 419, which cancels it (end of the area prohibited for driving instruction). Therefore the correct answer is 'until the sign that cancels it'.
Sign 418 is valid until sign 419, which cancels it
Thinking the sign is valid only until the nearest junction
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