Leaving a blocked lane early reduces the storage capacity of the road. In slow traffic/traffic jams the rule is to use all lanes possible until very close to th

Leaving a blocked lane early reduces the storage capacity of the road. In slow traffic/traffic jams the rule is to use all lanes possible until very close to the blockage. If you break that rule the jam becomes longer and could affect a crossing upstream. Jumping the queue counters this negative effect and is the correct behavior (in slow traffic).