Speed zoning
To ensure a safe environment for all road users, it is necessary to continuously review and modify speed zones.
We are responsible for speed zones on all roads across the state.
Requests for change in speed zones on local roads need to be submitted to the local government, who will assess the request and submit it to us if they agree with the change.
Speed zone changes from the last six months:
Brookton Highway - Karragullen - City of Armadale - Effective 1 September 2025:
The existing 90 km/h speed limit on Brookton Highway prior to Eugene Place after Conifer Road will be corrected to 80 km/h.
Millar Road - Wellard - City of Kwinana - Effective 8 September 2025:
The existing 70 km/h speed limit on Millar Road between McWhirter Promenade and Woolcoot Road will be adjusted to 60 km/h.
Gibbs Road - Forrestdale - City of Armadale - Effective 22 September 2025:
The existing 80 km/h speed limit on Gibbs Road from Boronia Road to Taylor Road will be adjusted to 60 km/h.
Gibbs Road - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 80 km/h speed limit on Gibbs Road from Beenyup Road to Boronia Road will be adjusted to 60 km/h.
Liddelow Road - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 70 km/h speed limit on Liddelow Road from Harper Road to Rowley Road will be adjusted to 60 km/h.
Beenyup Road - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 70 km/h speed limit on Beenyup Road from Tapper Road to Gibbs Road will be adjusted to 60 km/h.
Beenyup Road - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 80 km/h speed limit on Beenyup Road from Rowley Road to Gibbs Road will be adjusted to 60 km/h.
Gutteridge Road - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Gutteridge Road from Tapper Road to the end of the road will be adjusted to 60 km/h.
Myall Place - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Myall Place from Gutteridge Road to the end of the road will be adjusted to 60 km/h.
Murdoch Way - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Murdoch Way from Liddelow Road to the end of the road will be adjusted to 60 km/h.
Carlson Place - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Carlson Place from Murdoch Way to the end of the road will be adjusted to 60 km/h.
Hebble Loop - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Hebble Loop from Liddelow Road to Liddelow Road will be adjusted to 60 km/h.
Bartram Road - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Bartram Road from West of Muir Court to Boronia Road will be adjusted to 60 km/h.
Muir Court - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Muir Court from Bartram Road to the end of the road will be adjusted to 60 km/h.
Scofield Place - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Scofield Place h from Liddelow Road to the end of the road will be adjusted to 60 km/h.
Boronia Road - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Boronia Road from Bartram Road to Gibbs Road will be adjusted to 60 km/h.
Wilga Court - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Wilga Court from Liddelow Road to the end of the road will be adjusted to 60 km/h.
Coffey Road - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Coffey Road from Liddelow Road to Beenyup Road will be adjusted to 60 km/h.
Hausen Court - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Hausen Court from Gaebler Road to the end of the road will be adjusted to 60 km/h.
Follington Place - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Follington Place from Liddelow Road to the end of the road will be adjusted to 60 km/h.
Oxley Road - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Oxley Road from Liddelow Road to the end of the road will be adjusted to 60 km/h.
Springfields Close - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Springfields Close from Oxley Road to the end of the road will be adjusted to 60 km/h.
Wolfe Road - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Wolfe Road from Liddelow Road to Rowley Road West will be adjusted to 60 km/h.
Triandra Court - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Triandra Court from Beenyup Road to the end of the road will be adjusted to 60 km/h.
Kinley Road - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Kinley Road from Rowley Road to the end of the road will be adjusted to 60 km/h.
Carriage Chase - Banjup - City of Cockburn - Effective 22 September 2025:
The existing 50 km/h speed limit on Carriage Chase from Liddelow Road to the end of the road will be adjusted to 60 km/h.
Tonkin Highway - Wattle Grove - City of Kalamunda - Effective 6 August 2025:
The existing 80 km/h Speed limit on Tonkin Highway at Welshpool Road will be corrected as a speed extension to 70km/h.
Welshpool Rd - Wattle Grove - City of Kalamunda - Effective 6 August 2025:
The existing 80 km/h Speed limit on Welshpool Road at Tonkin Highway will be corrected as a speed extension to 70km/h.
Pomeroy Rd - Lesmurdie - City of Kalamunda - Effective 28 August 2025:
The existing 70 km/h speed limit on Pomeroy Road from Pruiti Crescent to before Welshpool Road East will be corrected as a School Zone Extension to 40km/h between 07:30-09:00am and 14:30-16:00pm.
Reid Rd - Lesmurdie - City of Kalamunda - Effective 28 August 2025:
The existing 50 km/h speed limit on Reid Road from the existing School Zone to Pomeroy Road will be corrected as a School Zone Extension to 40km/h between 07:30-09:00am and 14:30-16:00pm.
Oakover Road - Herne Hill - City of Swan - Effective 2 July 2025:
The existing default 80km/h speed limit on Oakover Road between Great Northern Hwy and Campersic Road will be corrected to 70km/h.
Campersic Road - Herne Hill - City of Swan - Effective 9 July 2025:
The existing default 80km/h speed limit on Campersic Road between Toodyay Road and Camague Dr will be corrected to 70km/h.
Irasburg Pde and Johnson Rd - Wellard - City of Kwinana - Effective 14 July 2025:
The existing 60 km/h speed limit on Irasburg Pde and Johnson Rd will be adjusted to 50km/h between McWhirter Prm and Breccia Pde.
Great Eastern Highway - Darlington - Shire of Mundaring - Effective 16 July 2025:
The speed limit on Great Eastern Hwy between Scott St and Lionel Rd will be reduced to 70 km/h.
For more information read the FAQ.
Kwinana Freeway on ramp from Gibbs Road - Aubin Grove - City of Cockburn - Effective 23 July 2025:
The existing 60 km/h speed limit on Kwinana Freeway on-ramp from Gibbs Road will be corrected to a speed extension to 100 km/h.
Reid Highway - Bennett Springs - City of Swan - Effective 30 July 2025:
The existing 80 km/h speed limit on Reid Hwy at Altone Rd will be corrected as a speed extension to 70 km/h.
Walker Rd – Serpentine – Shire of Serpentine-Jarrahdale - Effective 4 June 2025:
The existing Default speed limit on Walker Rd between Karnup Rd and Wattle Rd will be corrected to 70km/hr.
Wescott Rd – Hopeland – Shire of Serpentine-Jarrahdale - Effective 9 June 2025:
The existing Default speed limit on Wescott Rd between Utley Rd and Elliott Rd will be corrected to 50km/hr.
Gull Rd – Serpentine – Shire of Serpentine-Jarrahdale - Effective 11 June 2025:
The existing Default speed limit on Gull Rd between Hall Rd and 1500m East of Rapids Rd will be corrected to 50km/hr.
Hall Rd – Serpentine – Shire of Serpentine-Jarrahdale - Effective 11 June 2025:
The existing Default speed limit on Hall Rd between Summerfield Rd and Karnup Rd will be corrected to 50km/hr
Hall Rd – Serpentine – Shire of Serpentine-Jarrahdale - Effective 11 June 2025:
The existing Default speed limit on Hall Rd between Utley Rd and Fisher Rd will be corrected to 80km/hr.
Springfield Rd - Bedfordale - City of Armadale - Effective 18 June 2025:
The existing Default speed limit on Springfield Rd from the Albany Hwy intersection to Godwitt Retreat will be corrected to 60km/hr.
Rowley Rd – Hilbert – City of Armadale - Effective 23 June 2025:
The existing 80km/h speed limit on Rowley Rd between Tonkin Hwy Southbound Off Ramp and Hopkinson Rd will be corrected to 70km/hr.
Rowley Rd East – Darling Downs – City of Armadale - Effective 23 June 2025:
The existing 60km/h speed limit on Rowley Rd East between Hopkinson Rd and Hilbert Rd will be corrected to 50km/hr.
Rowley Rd East – Darling Downs – City of Armadale - Effective 23 June 2025:
The existing 70km/h speed limit on Rowley Rd East between Hilbert Rd and Eleventh Rd will be corrected to 50km/hr.
Hopkinson Rd – Darling Downs – City of Armadale - Effective 23 June 2025:
The existing 80km/h speed limit on Hopkinson Rd between Rowley Rd and Empire Rose Ct will be corrected to 70km/hr.
Leda Boulevard – Wellard – City of Kwinana - Effective 25 June 2025:
The existing Default 50km/h speed limit on Leda Boulevard between Wellard Rd and Brantwood Turn will be corrected to 60km/hr.
Forrest Rd – Haynes – City of Armadale - Effective 30 June 2025:
The existing Default 70km/h speed limit on Forrest Rd between Tonkin Hwy and Windom Rd will be corrected to 60km/hr.
Aurora Esplanade – Jindalee – City of Wanneroo - Effective Monday 12 May 2025:
The existing Default 50km/h speed limit on Aurora Esplanade between Bathers Promenade and Albican St will be corrected to 40km/hr.
Anchorage Drive – Mindarie – City of Wanneroo - Effective 14 May 2025:
The existing Default 50km/h speed limit on Anchorage Drive between Rosslare Prom and Alexandra View will be corrected to 40km/hr.
Elliott Rd - Keysbrook – Shire of Serpentine-Jarrahdale - Effective 19 May 2025:
The existing Default speed limit on Elliott Rd between South Western Hwy and Railway level crossing will be corrected to 50km/hr.
Elliott Rd - Keysbrook – Shire of Serpentine-Jarrahdale - Effective 19 May 2025:
The existing Default speed limit on Elliott Rd between Railway level crossing and 400m West of Westcott Rd will be corrected to 80km/hr.
Elliott Rd - Keysbrook – Shire of Serpentine-Jarrahdale - Effective 19 May 2025:
The existing Default speed limit on Elliott Rd between 400m West of Westcott Rd and Yangedi South Rd will be corrected to 50km/hr.
Randell Rd – Mardella - Shire of Serpentine-Jarrahdale - Effective 21 May 2025:
The existing Default speed limit on Randell Rd between Kargotich Rd and Wright Rd will be corrected to 60km/hr.
Henderson Rd – Hopeland – Shire of Serpentine-Jarrahdale - Effective 2 April 2025:
The existing Default speed limit on Henderson Rd between Wescott Rd and 900m east of Hopeland Rd will be corrected to 50km/hr.
Lightbody Rd – Mardella – Shire of Serpentine-Jarrahdale - Effective 7 April 2025:
The existing Default speed limit on Lightbody Rd between Mundijong Rd and Lowlands Rd will be corrected to 50km/hr.
Summerfield Rd - Oakford – Shire of Serpentine-Jarrahdale - Effective 9 April 2025:
The existing Default speed limit on Summerfield Rd between Lowlands Rd and Wright Rd will be corrected to 50km/hr.
Summerfield Rd - Oakford – Shire of Serpentine-Jarrahdale - Effective 9 April 2025:
The existing 80km/h speed limit on Summerfield Rd between Wright Rd Castle Rd will be corrected to 50km/hr.
Summerfield Rd - Oakford – Shire of Serpentine-Jarrahdale - Effective 9 April 2025:
The existing 60km/h speed limit on Summerfield Rd between Castle Rd and South Western Hwy will be corrected to 50km/hr.
Castle Rd – Oakford – Shire of Serpentine-Jarrahdale - Effective 9 April 2025:
The existing 80km/h speed limit on Castle Rd between Summerfield Rd and South Western Hwy will be corrected to 50km/hr.
Scrivener Rd – Serpentine – Shire of Serpentine-Jarrahdale - Effective 14 April 2025:
The existing Default speed limit on Scrivener between South Western Hwy and Firns Rd will be corrected to 50km/hr.
Doghill Rd - Baldivis - City of Rockingham - Effective 16 April 2025:
The speed limit on Doghill Rd, Baldivis between St Albans Rd and Young Rd will be formalised to 80 km/h.
Portside Promenade – Alkimos – City of Wanneroo - Effective 21 April 2025:
The existing Default 50km/h speed limit on Portside Promenade between Stemson Lane and Chart Close will be corrected to 40km/hr.
Pinetree Gully Rd - Willetton - City of Canning - Effective 23 April 2025:
The speed limit on Pinetree Gully Rd, Willetton between Kingsford Dr St and Balboa Row will be formalised to 40km/h.
Burrndah Bvd - Willetton - City of Canning - Effective 23 April 2025:
The speed limit on Burrendah Bvd, Willetton between Vahland Av and Kennon St and between Karel Av and Burren Gte will be reduced to Default BUA speed.
The speed limit on Burrendah Bvd, Willetton between Kennon St and Burren Gte will be reduced to 40km/h.
Maritime Drive - Jindalee - City of Wanneroo - Effective 28 April 2025:
The existing Default 50km/h speed limit on Maritime Drive between Bowsprit View and St Anthony Ave will be corrected to 40km/hr.
Franklin Rd - Jandabup - City of Wanneroo - Effective 28 April 2025:
The speed limit on Franklin Rd between Trichet Rd and Capron Rd will be reduced from 80 km/h to 70 km/h.
Rousset Rd - Jandabup - City of Wanneroo - Effective 28 April 2025:
The speed limit on Rousset Rd between Capron Rd and Lakeview St will be reduced from 80 km/h to 70 km/h.
Townsend Rd - Jandabup – City of Wanneroo - Effective 28 April 2025:
The speed limit on Townsend Rd between Rousset Rd and Hawkins Rd will be reduced from 80 km/h to 70 km/h.
Hawkins Rd - Jandabup - City of Wanneroo – Effective 28 April 2025:
The speed limit on Hawkins Rd between Townsend Rd and Wirrega Rd will be reduced from 80 km/h to 70 km/h.
Benmuni Rd - Jandabup - City of Wanneroo – Effective 28 April 2025:
The speed limit on Benmuni Rd between Trichet Rd and Nicholas Rd will be reduced from 80 km/h to 70 km/h.
Ashby St - Jandabup - City of Wanneroo - Effective 28 April 2025:
The speed limit on Ashby St will be reduced from 80 km/h to 70 km/h.
Jambanis Rd - Jandabup - City of Wanneroo - Effective 28 April 2025:
The speed limit on Jambanis Rd will be reduced from 80 km/h to 70 km/h.
Ross St - Jandabup - City of Wanneroo - Effective 28 April 2025:
The speed limit on Ross St will be reduced from 80 km/h to 70 km/h.
Badgerup Rd - Jandabup - City of Wanneroo - Effective 28 April 2025:
The speed limit on Badgerup Rd between Jambanis Rd to Ocean Reef Upper Swan Hwy will be reduced from 80 km/h to 70 km/h.
Sydney Rd - Jandabup - City of Wanneroo - Effective 28 April 2025:
The speed limit on Sydney Rd from Pine Crest Wy to Ocean Reef Upper Swan Hwy will be reduced from 80 km/h to 70 km/h.
Main Roads' Speed Zoning Policy and Application Guidelines, published in May 2020, adopted the replacement of Speed Buffer Zones with “Speed Limit AHEAD” signs. This allows the lowering of speed limits by greater than 30 km/h using repeated sets of “Speed Limit Ahead” signs.
Key Messages
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Speed Buffer Zones have been removed in the latest version of Australian Standards and have been replaced with “Speed Limit AHEAD” signs.
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The “Speed Limit AHEAD” signs replace the need for Speed Buffer Zones and achieve the same outcome by warning road users to slow down prior to a reduced posted speed limit.
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In WA, there will be two sets of “Speed Limit AHEAD” signs prior to any speed limit reduction which is more than 30km/h.
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The use of “Speed Limit AHEAD” signs will bring Western Australia in line with the other states and territories across Australia.
When does it go live?
Since mid-2020, Main Roads has stopped implementing Speed Buffer Zones. Main Roads is not rolling out wholesale changes to existing Speed Buffer Zones, but is doing so gradually by working with the regions/local government when they seek review of, or changes to, speed limits. Some regional areas of WA are already utilising the “Speed Limit AHEAD” signs instead of “Speed Buffer Zone” signage.
What is changing?
Previously, a short 300-400 metre Intermediate Speed Zone (e.g. An 80 km/h zone, where the speed was being reduced from 100km/hr to 60km/hr) would be used as a Speed Buffer Zone prior to any speed limit reduction which was more than 30km/h . Since mid-2020, this Intermediate Speed Zone is no longer required, and two sets of “Speed Limit AHEAD” signs (e.g. 60 AHEAD) would be installed instead.
Where are the changes occurring?
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The changes will continue to gradually occur state wide.
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Some Speed Buffer Zones have already been replaced by “Speed Limit AHEAD” signage.
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The use of “Speed Limit AHEAD” signs is in harmonisation with other states and territories in Australia.
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The placement of “Speed Limit AHEAD” signs considers road conditions, and is typically at four to ten seconds of travel time from the change in speed limit.
What do I need to do differently?
When you see “Speed limit AHEAD” signs, you should prepare to reduce your speed to ensure you do not exceed the posted speed limit by the time you enter the new speed zone ahead.
Where will the speed limit be enforceable?
Speed limits are enforceable from the time a driver passes a speed limit sign, or from the time a driver enters a road which is subject to a default speed limit. The “Speed Limit AHEAD” signs are advisory signs pre warning drivers that a new speed limit is coming up ahead.
School Zones and Children's Crossings Improvement Program
In April 2024, the Cook Government announced a $10 million investment to enable safety improvements at school warden crossings across Western Australia.
Main Roads has identified Children’s Crossings on roads with speeds of 50 km/h or higher situated outside school zones across the estate. To implement a 40 km/h speed limit, static speed signs will be installed at all these crossings by June 2025. On roads with speeds of 60 km/h or higher, these static signs will be progressively replaced with Electronic Speed Limit Signs (ESLS) by June 2028.
Unlike School Zone Area signs, which include “School Zone” and “End School Zone” markers, Traffic Warden Controlled Children’s Crossings are not in a School Zone and are marked with speed reinstatement signs without “End School Zone” indicators.
The 40 km/h limit is enforced during school days from 7:30 to 9:00 AM and 2:30 to 4:00 PM, aligning with school zone times. The hours in regional areas may vary.
Speeding infringements
We set the speed limit on major roads and WA Police Force is responsible for enforcing these laws.
If you wish to dispute your speeding infringement, contact the Department of Transport.
To find out the speed limit on a metropolitan road, send us a copy of your infringement and we’ll have a look into it. If the infringement occurred on a regional road, contact our nearest regional office.
Be roadwork aware - slow down and take care
You can bet you will encounter roadworks and mobile traffic management on your travels - from speed and lane restrictions and possibly a modified road layout.
There are many safety hazards to both road users and construction workers within roadwork zones. It is important to follow the rules and be courteous, even when workers are not on-site as the unsealed or uneven road surface can be dangerous.
Always follow the signs – even if workers are not on-site, avoid ‘rubbernecking’ while driving and only overtake if it is safe.
We want everyone to get home safely to their families.
Video courtesy of the Traffic Management Association of Australia.