Test yourself
What a One Way sign actually tells you
The sign at a glance
| Category | Regulatory |
| Shape | Rectangle |
| Colours | Black background with a white arrow |
| Standard | AS 1742 (Australian Standard for traffic signs) |
| Appears in | All states and territories |
The One Way sign is a regulatory sign: a white rectangular plate with a bold black horizontal arrow, usually carrying the words "ONE WAY". It is mounted side-on at the corner of a street or on the far side of an intersection, and the arrow does one job — it points to the only direction traffic on that road is allowed to travel. If the arrow points right, every vehicle on that road is travelling right; there is no oncoming line of cars. Because it is a regulatory sign and not a warning, obeying it is a legal requirement, not advice.
Two things make it easy for a learner to miss. First, it is often small and mounted flat along the flow of the street rather than facing you head-on, so you have to actively look for it as you approach a corner. Second, people confuse it with the No Entry sign. They are a pair, but they are not the same: the One Way sign tells you which direction you may travel once you are on the road; the red-and-white No Entry sign, usually sitting at the other end of that same street, tells you that you must not enter from that point at all. Read the arrow, commit to that direction, and you have understood the sign.
Why one-way streets exist
One-way systems are not there to trap you — they solve real traffic problems, and understanding why makes them easier to drive. Removing the oncoming stream roughly doubles a road’s usable width, so a narrow inner-city street can carry two or three lanes all flowing the same way instead of one lane in each direction. It also removes the single most dangerous conflict on any road: the head-on crash. Intersections get simpler and safer too — with vehicles arriving from fewer directions, signal phases can be shorter, turning traffic crosses fewer streams, and pedestrians have fewer directions to watch.
That is why one-way streets cluster in CBD grids, around station, court and town-hall precincts, in narrow laneways, and inside large car parks, where space is tight and foot traffic is heavy. Some form a "gyratory" — a large one-way loop around a block that behaves like a stretched-out roundabout — and councils also use them to stop drivers rat-running through quiet residential streets. Knowing the why helps on the road: on a one-way street you can relax about oncoming cars, but you must stay alert to traffic and cyclists passing on either side of you, and to pedestrians who may instinctively look the "wrong" way before stepping out.
How to drive a one-way street correctly
Once you are on a one-way street, a few habits change from an ordinary two-way road. You can use the full width — choose the lane that suits your next move: left lanes to turn left or park, right lanes to turn right or overtake. On a one-way road with more than one lane, the Australian Road Rules allow you to pass on either side, left or right, provided you stay within the lane lines and it is safe. That is something you cannot do on a normal two-way road, so do not be alarmed when a vehicle legally passes on your left.
What you cannot do is reverse your direction. A U-turn on a one-way street would point you straight into the flow, so it is not permitted — if you need to go back, drive on and use the surrounding streets. Turning onto a one-way street is where learners get caught most: you may turn either left or right into it, but only if you finish up travelling the way the arrow points. Never turn so that you end up facing the traffic. And do not assume "one way" means "nothing can come towards me" — many one-way streets in Sydney and Melbourne carry a contraflow bike lane, so a cyclist can legally be riding the opposite way. Check both directions before you cross or pull out, every single time.
Spotting a one-way street before you turn in (and how it’s tested)
The trap on your driving test and on the road is rarely obeying a One Way sign you can already see — it is turning into a one-way street the wrong way because you never spotted it. Learn the clues. A No Entry sign facing you means the street beside it runs one-way away from you, so do not turn in there. Parked cars all facing the same direction on both kerbs are a strong hint the street is one-way. A wide street with no centre line, and lane arrows painted on the road all pointing the same way, tell the same story. At the corner, glance for the flat "ONE WAY" plate mounted along the street.
On test, examiners are watching whether you scan for these signs before you commit to a turn, and whether you still do everything else properly. A one-way street does not remove your normal duties — you must still head-check your mirrors and blind spot, give way to pedestrians crossing the street you are entering, and give way to vehicles already established on the road. Slow down, read the corner, and only turn in if you will be travelling with the arrow. Doing that calmly and deliberately is exactly the observation examiners want to see.
Where you’ll see it
Most often in city and town centres, around station, court and town-hall precincts, in narrow laneways, on gyratory loops around a block, and inside large multi-storey and shopping-centre car parks — anywhere space is tight or pedestrian traffic is heavy. It is usually mounted horizontally at the corner of the street or on the far side of an intersection, frequently paired with a No Entry sign at the street’s other end.
Common mistakes learners make
- Turning into a one-way street against the arrow — usually a right turn from a side street — and ending up facing the oncoming flow.
- Confusing the One Way sign with the No Entry sign: One Way tells you which direction you may travel, while No Entry (red circle, white bar) tells you that you must not enter from that point at all.
- Assuming "one way" means nothing can come towards you, then crossing or pulling out without checking both directions — many one-way streets have a contraflow bike lane with cyclists coming the other way.
- Attempting a U-turn on a one-way street to double back, which points you straight into the traffic flow and is not permitted.
- On the driving test, dropping normal head-checks and give-way duties because "it’s only one-way" — examiners still expect full observation and priority to pedestrians and to traffic already on the road.
- Sitting in the wrong lane and being surprised when a vehicle legally passes on your left, which the rules allow on a multi-lane one-way road.
Last verified 4 September 2026 against the Australian Road Rules and your state road authority.
Check the official source before you rely on this
Rules and pass requirements are set by each state and territory road authority and can change. Always confirm the current details with the official source for your state — Transport for NSW, VicRoads (Victoria), Queensland Transport, or the equivalent authority where you live. This page is a free study guide, not a substitute for the official handbook.
More road signs
Keep going — tap another sign to see what it means and where it appears.
Bicycle sign
Bicycle and shared path signs in Australia: what they mean, the bike-lane rule,…
Give way sign
A Give Way sign means slow down, be ready to stop, and let…
Keep left sign
The Keep Left sign means pass to the left of that island or…
Merge sign
A merge sign means two lanes become one. Learn the Australian give-way rule…
No entry sign
A No Entry sign means you must not drive past it. Learn what…
All road signs
Browse every sign on the knowledge test.
Frequently Asked Questions
- How do I turn into a one-way street correctly?
- A One Way sign means traffic may travel only in the direction the black arrow points, and obeying it is the law. You may turn either left or right into a one-way street, but only if you finish up travelling the way the arrow points - never turn so that you end up facing the traffic.
- Can another car legally pass me on the left on a one-way street?
- Yes. On a one-way road with more than one lane the Australian Road Rules let vehicles pass on either side, left or right, provided they stay within the lane lines and it is safe. So do not be alarmed when a car legally passes on your left, which you could not do on a normal two-way road.
- Does ’one way’ mean nothing can ever come towards me?
- Not always. Many one-way streets in cities like Sydney and Melbourne carry a contraflow bike lane, so a cyclist can legally be riding the opposite way. Check both directions before you cross or pull out every time, and remember a U-turn on a one-way street is not permitted because it points you straight into the flow.