I agree with SODiron. The lane isn’t closed until you get to the cones or end of lane. People moving to the next lane before the end of lane causes more congestion further down the line; if everyone utilised both lanes traffic would be more flowing. The only issue is if the traffic is flowing normally and there is a person going faster in one lane. If the traffic is flowing normally, the cars in both lanes should match speed and there should be no issue, where there can be easy adjustment for when lanes merge.
