Lane Filtering in WA: The Rules for Perth Riders
Lane filtering has been legal in Western Australia since March 2021, but the rules are narrower than a lot of riders assume — and they're not the same as the rules in New South Wales or Queensland. Get it wrong and it's a $100 fine and two demerit points.
This guide covers exactly what filtering is, who's allowed to do it, where it's banned, and what WA's own review of the law found after it had been running for a couple of years.
The Quick Answer
| Lane filtering | Lane splitting | |
|---|---|---|
| What it is | Riding between two lines of stopped or slow traffic going the same way, at 30 km/h or less | Riding between traffic that's moving, or at more than 30 km/h |
| Legal in WA? | Yes, for fully licensed riders, when safe | No — always an offence |
If you're moving faster than 30 km/h between lanes, or the traffic beside you is flowing, you're splitting, not filtering, and it's illegal regardless of anything else on this page.
What Counts as Lane Filtering
The Road Safety Commission's definition:
Lane filtering is a manoeuvre where a motorcycle rider travels at low speed — no more than 30 km/h — between two lanes of stationary or slow-moving vehicles travelling in the same direction.
The rules sit in the Road Traffic Code 2000, amended to allow filtering from 29 March 2021.
Three things have to be true at once:
- You're going 30 km/h or less. This is the single most important number. It's also the filtering speed limit in every other Australian state — WA isn't unusually strict on this point.
- The traffic you're passing is stationary or slow-moving, and travelling the same direction as you. Filtering into oncoming traffic, or across a median, is not filtering.
- It's safe to do. This is a rule in its own right, not just advice — filtering when it isn't safe is an offence even if you meet every other condition.
While filtering, you're allowed to ride on and over the continuous (unbroken) white lines that separate same-direction lanes. Crossing those lines is normally an offence; the filtering law specifically permits it.
Who Can Lane Filter
Only fully licensed riders. If you're on a learner's permit or still in your provisional (R-E) period, you must not lane filter at all — full stop, regardless of speed or conditions.
The reasoning the Commission gives is that filtering "requires a high level of riding ability, road awareness and hazard perception, and is difficult for inexperienced riders to do safely." The learner and provisional exclusion is set out in Transport WA's Ride Safe handbook and its road rules for restricted motorcycle riders. If you're working through the licence stages, see our WA scooter and motorcycle licence guide for where you sit.
Two types of bike can never filter, whoever is riding:
- Motorcycles with a sidecar
- Three-wheeled motorcycles (trikes)
Where You Can Filter
Between two lines of vehicles travelling the same direction, at 30 km/h or less, when it's safe — most commonly easing to the front of a queue at a red light or crawling past stopped traffic on a congested arterial.
That's the whole of the "allowed" list. Everything else is covered by the prohibitions below.
Where You Can't Filter
Per the Road Safety Commission, filtering is not permitted:
| Situation | |
|---|---|
| Approaching or on a children's crossing, marked foot crossing, or pedestrian crossing | Banned |
| In a school zone or shared zone | Banned |
| Where the speed limit is 40 km/h or below | Banned |
| Between one or more heavy vehicles (GCM of 22.5 tonnes or more) | Banned |
| Where vehicles are merging | Banned |
| Where overtaking is prohibited | Banned |
| In a roundabout | Banned |
| In or next to a bicycle lane, bus lane, or other special-purpose lane | Banned |
| Next to the kerb or edge of the road, or alongside parked cars | Banned |
| Any time it is not safe | Banned |
Two of these catch people out regularly:
- No kerb or edge filtering. Squeezing up the left of a single lane of stopped traffic, between the cars and the kerb or a row of parked cars, is not legal filtering in WA — even though some other states allow it. You need two lines of traffic and you filter between them.
- No filtering past trucks. Riders often feel safer moving past a heavy vehicle than sitting behind it, and WA's own review noted that frustration — but the prohibition stands, and every other state has the same rule.
The Penalty
The Road Safety Commission states:
A penalty of $100 and 2 demerit points apply to riders who do not follow lane filtering rules.
That's the lowest lane-filtering penalty of any Australian state. Before March 2021, riding between lanes was simply illegal; now it's only an offence when you're outside the conditions above — over 30 km/h, in a banned location, or when it isn't safe.
Why the 30 km/h Limit
The Commission's stated reason for capping filtering speed is crash survivability. A person struck by a vehicle at 30 km/h or below has around a 90% chance of survival; at 45 km/h that drops to less than 50%. Motorcyclists are themselves vulnerable road users, and the risk of a fatal outcome climbs steeply once impact speeds pass 30 km/h.
Has It Worked? WA's 2023 Review
The Road Safety Commission reviewed the law about 18 months after it started, using crash data, offence data, an interstate comparison, and a community survey with a knowledge test. The summary was published in early 2024.
What it found:
- Crashes: no notable change in rear-end or side-swipe crashes involving motorcyclists since the law came in. The data is limited, but there was no sign of it making things worse, and the Commission's read was that it "appears to have contributed to safer riding behaviour in general."
- Compliance: no notable change in riders being penalised for filtering-related offences. Most survey respondents had seen riders breaking the rules — but almost half of riders said they'd changed their own riding to comply with the new conditions.
- Knowledge: "a large portion of the community lacks awareness and accurate knowledge of the law." Most riders knew filtering was legal but were fuzzy on which specific manoeuvres are allowed. Lane-filtering information has since been added to Transport WA's Ride Safe handbook.
- Other benefits: shorter travel times, and less time spent sitting in heat and exhaust fumes.
What it recommended: no change to the rules. It called for community education, more research into whether filtering past heavy vehicles and entering bicycle storage boxes at lights could be made safe, and — given how hard filtering is to police — possible use of safety cameras to catch offences down the track.
Practical Tips
Legal and safe aren't the same thing. A few things worth keeping in mind:
- Treat gaps as temporary. Traffic that's stopped can move without warning. Filter to the front at lights, not into the middle of a queue that's about to roll.
- Watch for cars changing lanes. Drivers hunting for a faster lane in stop-start traffic are the classic side-swipe risk. Cover your brakes and assume they haven't seen you.
- Cars turning across you at intersections and driveways won't be expecting a bike coming up the lane line — slow right down through those points.
- Mirrors and doors. In slow traffic, expect a door to open or a passenger to step out.
- Be visible. Lights on, and don't sit in blind spots as you move up.
- If in doubt, hold your lane. Filtering is a choice, not an obligation. When the gap's tight or the surface is bad, staying put is the call.
Quick-Reference Summary
- Legal? Yes, since 29 March 2021, for fully licensed riders
- Max speed? 30 km/h — above that it's illegal lane splitting
- Learners / P-platers? No — full licence only
- Sidecars / trikes? No
- Can I filter up the kerb side of one lane? No — you need two lines of traffic and you go between them
- Past trucks? No
- In a school zone or a 40 km/h zone? No
- On continuous white lines? Yes, while filtering
- Penalty for getting it wrong? $100 and 2 demerit points
Information based on Western Australia Road Safety Commission guidance and the 2023 Motorcycle Lane Filtering Post-implementation Review, current as of mid-2026. Rules can change — check wa.gov.au/organisation/road-safety-commission/lane-filtering for the latest.