Are you permitted to change lanes before you have passed the road signs that indicate a reduction of the number of lanes?
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You should change lanes as soon as is possible. This is because you will then have completed the lane change before your lane ends. If you wait, there is a risk that you will get stuck at the end of your lane (e.g. a line of cars could suddenly appear in the right-hand lane).
There is no rule that prevents you from changing lanes at the point at which the video ends. Just follow the regular rules for changing lanes:
“A driver may only [...] change lanes [...] if it is possible to do so without causing a hazard or an obstruction to other road-users.” (Road Traffic Ordinance)
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