At the end of the video, a junction can be seen further ahead. Is it possible that you could have an obligation to give way to intersecting traffic there?
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There are several reasons that could mean that you have an obligation to give way, despite the fact that you are currently on a priority road. The priority road could end, for example, or perhaps the intersection at the junction could be between two priority roads.
There is also a driving licence book online (2024).
More examples of explanations: