Correct answer
When lane width makes it necessary and it can be done safely.
When lane width makes it necessary and traffic safety allows, under Annex I of the General Traffic Regulations. The rule does not set a universal three-metre threshold here. Crossing the marking for a permitted manoeuvre, such as a lane change, differs from travelling on it and requires respecting priority in the lane entered.
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Whenever it is broken, even without necessity.
When you want to prevent another vehicle using its lane.
When lane width makes it necessary and it can be done safely.
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