Don’t slip up when turning

Bus turning right at a T-junction.
It’s best to use the slip lane when turning left. Image: RAA/JP

You’re heading east on Greenhill Road and pull up at the Unley Road intersection. You’re suddenly overwhelmed by a craving for Singapore noodles from the Adelaide Central Market, but you’ve already passed the left-turn slip lane. Can you still turn left at the intersection?

According to the Australian Road Rules (ARR), you can’t legally make the turn. The rules state a driver turning left at an intersection from a multi-lane road with a slip lane, must approach and enter the intersection from the slip lane.

Intersection showing car past the slip lane indicating to turn left.
Can the red car turn left in this situation? Graphic: RAA/Karl Larsen

The ARRs define a multi-lane road as a one-way or two-way road with two or more marked lanes (except bicycle lanes) that are on the side of the dividing or median strip.

This means that even a single-lane road becomes a multi-lane road at the start of the slip lane, so it’s best not to perform this manoeuvre at any junction with a slip lane.

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The yellow car turning left could create a hazard for other road users. Graphic: RAA/Karl Larsen

Turning left beyond the slip lane could cause confusion among other road users, including:

  • Drivers behind you travelling straight ahead, waiting for you to complete the left turn
  • Cyclists travelling straight ahead in the same direction
  • Pedestrians crossing the road you’re turning into
  • Anyone turning left at the slip lane, who isn’t expecting a vehicle to be entering the road from that point.

Penalty

The penalty for breaking this rule is $399 plus $105 Victims of Crime Levy and two demerit points.

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