A driving tactic that nullifies would-be queue-cutters appears to have been green-lighted by authorities.

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In Tasmania, the zip merge rule dictates that when two lanes become one, drivers must give way to any vehicle in front of them.

Motorists are using a lane-changing tactic to block would-be queue-cutters. Picture by Phillip Biggs

In the instance of heavy traffic, this should result in two lines of equal length and cars giving way one by one.

Instead, drivers often opt to merge early, resulting in one long line of traffic and one near-empty

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