
Speed limits in Western Australia vary depending on the type and gross weight of the vehicle, the road type and zone, and the driver's licence status. The agency responsible for determining the speed limit in Western Australia is Main Roads WA (MRWA), whose engineers consider factors such as general topography, road design, and urban density when setting speed limits. The default speed limit in non-residential areas is typically 110 km/h, while the default speed limit in built-up areas is 50 km/h. Speed limits are strictly enforced in Western Australia, with penalties ranging from $100 to $1,200 for speeding violations.
| Characteristics | Values |
|---|---|
| Agency responsible for setting speed limits | Main Roads WA (MRWA) |
| Factors considered while setting speed limits | General topography, road design, and urban density |
| Speed limit in built-up areas | 50 km/h |
| Speed limit in rural or undeveloped areas | 110 km/h |
| Speed limit for learners (L Plate) | 100 km/h |
| Speed limit for provisional drivers (P Plate) | 100 km/h |
| Speed limit on non-residential roads | 110 km/h |
| Speed limit on freeways | 100 km/h |
| Speed limit in rural areas | 110 km/h |
| Tolerance in urban areas | 6 km/h |
| Tolerance on highways | 9 km/h |
| Penalty for speeding (9 km/h or less) | $100 |
| Penalty for speeding (more than 9 km/h but not more than 19 km/h) | $200 |
| Penalty for speeding (more than 19 km/h but not more than 29 km/h) | $400 |
| Penalty for speeding (more than 29 km/h but not more than 40 km/h) | $800 |
| Penalty for speeding (more than 40 km/h) | $1,200 |
| Types of speed limits | Absolute, presumed, and basic |
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What You'll Learn

Speed limits in Western Australia range from 5 km/h to 130 km/h
Speed limits in Western Australia vary from 5 km/h to 130 km/h. The Main Roads WA (MRWA) is the agency responsible for determining speed limits in Western Australia. The speed limit in a particular area is determined by MRWA engineers, who consider factors such as general topography, road design, and urban density.
The default speed limit in built-up areas is 50 km/h, while in rural or undeveloped areas, it is 110 km/h. These default speed limits apply in the absence of posted speed restriction signage. Speed limits may also vary depending on the type of vehicle and the driver's licence status. For example, the maximum speed limit for learner drivers in Western Australia is 100 km/h.
It's important to adhere to speed limits to ensure the safety of all road users and reduce the risk of accidents. Speed limits are enforced in Western Australia, and speeding infringements may be issued if a vehicle exceeds the posted speed limit. The penalties for speeding can be costly, and speeding increases the likelihood of crashes and severe injuries.
In addition to posted speed limits, drivers should also be mindful of temporary speed limits in construction zones or areas with road hazards. Driving at a safe speed is crucial to account for conditions such as rain, traffic density, and poor visibility. By obeying speed limits and adjusting their speed as needed, drivers can help improve road safety in Western Australia.
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The Main Roads WA or MRWA determines speed limits
In Western Australia, the Main Roads WA (MRWA) is the agency responsible for determining speed limits. The speed limit in any particular area is determined by MRWA engineers and is based on factors such as the general topography of the location, urban density, and road design. The Road Safety Commission is responsible for research and policy development for road safety strategies.
MRWA considers various factors to ensure that the set speed limits are safe for all road users, including motorists, pedestrians, and animals. These factors include the specific characteristics of the road, such as its design and topography, as well as the surrounding area, including urban density. By taking these factors into account, MRWA can establish speed limits that are appropriate for the specific conditions of each road and its surroundings.
The speed limits set by MRWA vary across Western Australia due to differences in road conditions and settings. For example, the speed limit in Perth may differ from that of major highways like the Indian Ocean Drive. Additionally, speed limits can depend on the type and weight of the vehicle, with caravan speed limits usually differing from those for cars.
In Western Australia, the default speed limit for non-residential roads and rural interstate highways is typically 110 kilometres per hour, unless otherwise posted. On the other hand, the default speed limit for freeways is generally 100 kilometres per hour. It is important to note that these speed limits may not apply to learner and provisional drivers, who often have different restrictions in place.
While MRWA determines the speed limits, the enforcement is typically carried out by national or regional police and/or judicial bodies. It is important to adhere to the posted speed limits, as exceeding them can result in penalties. Additionally, speed limits may change temporarily due to roadworks or other temporary conditions, so drivers should remain alert and adapt their speed accordingly.
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The speed limit in built-up areas is 50 km/h
Speed limits in Western Australia vary depending on the type of road and zone. The speed limit in built-up areas is 50 km/h. This is a default speed limit that applies in the absence of posted speed restriction signage. This limit is in place to balance road safety with land use, amenity, and transport efficiency.
In Western Australia, the agency responsible for determining speed limits is Main Roads WA (MRWA). MRWA engineers consider factors such as general topography, road design, and urban density when setting speed limits. The speed limit in any particular area is determined based on these factors.
It is important to adhere to speed limits to ensure the safety of all road users, including drivers, other motorists, pedestrians, and animals. Speed limits are established to protect everyone on the road, and they are based on what is safe for the different types of roads and environments. Speeding increases the chances of a crash and the likelihood of serious injury or death.
There are different speed limits for learners and provisional drivers in Western Australia. The maximum speed for learners and P-plate drivers is 100 km/h. Additionally, provisional driver's licence holders are typically restricted from driving between midnight and 5 am during the first six months of holding a licence.
It is worth noting that speed limits in Western Australia may vary depending on the type and weight of the vehicle. For example, caravan speed limits are usually different from those that apply to cars.
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The speed limit for learners and provisional drivers is 100 km/h
Speed limits in Western Australia vary depending on the type of road and the zone. The speed limit in any particular area is determined by engineers from the Main Roads WA (MRWA) and is based on factors such as general topography, road design, and urban density. The default speed limit within built-up areas is 50 km/h, while in rural or undeveloped areas, it is typically 110 km/h.
However, there are different speed limits for learner and provisional drivers. The maximum speed limit for learners, or L-plate drivers, in Western Australia is 100 km/h. This restriction is in place to ensure the safety of new drivers as they gain experience on the road. It is important for learners to adhere to this speed limit, as speeding is a major cause of fatalities and severe injuries on Western Australian roads.
Provisional drivers, or P-plate drivers, also have a maximum speed limit of 100 km/h. This restriction helps new drivers transition to the full privileges of an unrestricted license gradually. P-plate drivers also face other restrictions, such as a curfew that prohibits them from driving between midnight and 5 am during the first six months of holding a driver's license. These measures aim to reduce the risk of accidents and provide a structured learning process for new drivers.
It is worth noting that speed limits may vary depending on road conditions and specific zones. For example, in school zones, drivers need to slow down to 40 km/h to ensure the safety of children and other road users. Additionally, the speed limit on freeways is typically 100 km/h unless zoned differently. It is crucial for all drivers, including learners and provisional drivers, to remain vigilant and adapt their speed according to the posted limits and road conditions.
Western Australia takes speeding offenses seriously, with penalties ranging from $100 to $1,200 for exceeding the speed limit by more than 9 km/h. Driving at excessive speeds increases the likelihood of crashes and makes it more difficult to stop in time, endangering both the driver and other road users. Therefore, adhering to the speed limit is essential for maintaining safety on Western Australian roads.
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There are three types of speed limits: absolute, presumed, and basic
Speed limits in Western Australia vary depending on the type and weight of the vehicle, road type, zone, and geographical factors such as topography, road design, and urban density. The Main Roads WA (MRWA) is the agency responsible for determining the speed limit in the state. While there are no specific laws regarding the types of speed limits in Western Australia, the speed limits can be understood using the three general categories of speed-limit laws: absolute, presumed, and basic.
Absolute speed limits are the simplest to understand. If you exceed the posted speed limit, you have broken the law. For example, California's "maximum speed limit" law sets the absolute limit for most highways at 65 miles per hour. So, a California motorist driving faster than 65 miles per hour will generally be guilty of speeding, regardless of how safely they were driving. In Western Australia, the absolute speed limit for learners and provisional drivers is 100 kilometres per hour, while the default speed limit in non-residential roads is 110 kilometres per hour unless otherwise posted.
Presumed speed limits, also called "presumptive" and "prima facie" limits, are more complex than absolute speed laws. When you are caught breaking a presumptive speed limit, the judge will presume you have broken the law, but you can still argue your case. For instance, if you are driving at 32 miles per hour in an urban district with a prima facie limit of 30 miles per hour, you can try to convince the judge that your speed was safe given the light traffic and good weather.
Basic speed limits prohibit driving at an unsafe speed. Typically, no presumptions or specific limits are involved. For example, the basic speed laws of New York and Florida make it illegal to drive at a "speed greater than is reasonable and prudent under the conditions and having regard to the actual and potential hazards then existing." With basic speed laws, a motorist can generally be convicted of speeding even for driving slower than the posted limit—it depends on what is considered safe under the circumstances.
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Frequently asked questions
Speed limits in Western Australia vary depending on the area and range from 5 km/h in shared zones to 110 km/h in rural areas. The speed limit in any particular area is determined by engineers from Main Roads WA (MRWA) and is based on factors such as topography, urban density, and road design.
There are three types of speed limits in Western Australia: absolute, presumed, and basic.
The maximum speed limit for learner drivers in Western Australia is 100 km/h.
The penalties for breaking the speed limit in Western Australia depend on how much you exceed the limit. For example, speeding by more than 9 km/h but not more than 19 km/h will result in a $200 fine.





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