Victorian road rule 130 requires drivers to keep left unless overtaking on roads with speed zones higher than 80km/h or where a 'Keep Left Unless Overtaking" sign is shown.

There are some exceptions to this rule including the following:
- You are overtaking another vehicle
- Avoiding an obstruction

- Preparing to make a right hand turn
- The left lane is congested with traffic
- The left lane is a slow vehicle lane
- If a 'left sign must turn left' sign applies to the lane
- The left lane is a special vehicle lane such as a bus lane

This video gives an overview of when the 'keep left unless overtaking' rule does and does't apply.

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