The 'a metre matters rule' has been extended in the ACT during a review of the two-year trial that ended on 31 October 2017.
When overtaking cyclists, motorists in the ACT must allow a sideways distance of at least one metre in a speed zone of 60 kilometres per hour or below and at least 1.5 metres in a higher speed zone.
The overtaking distance is measured from the right-most part of the bicycle, the rider or any trailer attached to the bicycle to the left-most part of the motor vehicle or anything projecting from the vehicle or any trailer (for example, a side mirror) at a height that could strike the rider or their bicycle or trailer.
To enable drivers to provide the minimum overtaking distance on narrow roads or on roads with narrow lanes, motorists may cross centre lines, straddle lane-lines and drive on painted islands if the driver has a clear view of any approaching traffic and it's safe to do so.
See also page 111 of 'ACT Road Rules Handbook': https://www.accesscanberra.act.gov....JTIxJTIx/filename/ACT+road+rules+handbook.pdf