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WELCOME TO OUR SAFETY & EDUCATION section

At SW Weigh we are serious about Safety First, so we have created this section to arm you with knowledge and information regarding WA's road laws, towing laws, facts as well as definitions to all those weight acronyms! 

We hope you enjoy our site and take a moment to drop us a line.

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Safety First at SW Weigh

Know the WA Road Rules!

There are specific road rules that apply to motorists towing caravans, camper trailers, horse floats, boats and more:

  • The maximum legal speed limit for any vehicle towing a trailer or caravan is 100km/h in WA
  • Vehicles towing a caravan or trailer must drive at least 60m behind heavy vehicles or other towing vehicles, unless overtaking. Drivers of road trains or B-doubles must maintain a following distance of at least 200m, unless overtaking.
  • People are not permitted to ride in a trailer or caravan that is being towed.
  •  Failure to restrain a load correctly may result in legal action, including a fine of up to $5,000 
  • If you are towing a load wider than your vehicle, you must have towing mirrors in place

 

You must not drive a vehicle that is carrying a load:

  • If the load makes the vehicle unstable or otherwise unsafe.
  • If the load projects from the vehicle in a way that could injure a person, obstruct the path of other drivers or pedestrians, or damage a vehicle or anything else (including the road surface).
  • Unless the load is restrained on the vehicle so that the load, or any portion of it is unlikely to fall or become dislodged from its restraints.
  • Be sure you know the legal load limit for your vehicle and make sure your load is well secured as incorrectly secured loads can increase the likelihood of rollovers.


Learn more about WA towing Laws IB - 107 - Safe Towing (transport.wa.gov.au) 


Don't guess your weights, weigh your rig to be safe, sure and legal. Protect yourself, protect your family and protect those around you.


Enjoy your holiday with peace of mind.

Safety First at SW Weigh

Safety Tips for Drivers*

* Thanks to 'IB-107B Vehicle Safety and Standards Information Bulletin by DoT WA'


Towing and Driver Fatigue

  • Towing requires more knowledge and skill than normal driving. It can be more stressful and is likely to cause the early onset of fatigue. Be sure to plan your trip, get plenty of rest before embarking, and take regular breaks to avoid fatigue. 
  • Remember, the correct matching of the towing vehicle and the trailer or caravan is essential for safe towing. Check your vehicle handbook and consult your vehicle, trailer and caravan dealers on all towing performance and safety aspects.


How much can you Safely Tow? 

  • The manufacturer's recommended trailer load and tyre loads must not be exceeded. The load on a vehicle must not be placed in a way that makes the vehicle unstable or unsafe.  
  •  If the vehicle's towing capacity cannot be determined, the loaded mass of the trailer must not exceed the empty mass (tare) of the towing vehicle, excepting where the trailer is  fitted with brakes in which case the loaded mass of the trailer must not exceed 1.5 times  the empty mass of the towing vehicle. 
  • If the trailer is not fitted with brakes then the loaded mass of the trailer must not exceed 750kg. 
  • The loaded mass of the trailer must not exceed the towing capacity of any component in  the vehicle/trailer combination, including the towbar and towball.  
  • The loaded mass of the trailer must never exceed the trailer's ATM.  


Safety tips for drivers 

The following procedures will help reduce risks and improve towing safety: 

  • Remember to allow for the extra length and width of trailers and caravans, and their tendency to “cut in” on corners and curves. 
  • The extra weight of your vehicle and trailer combination requires greater stopping distance when braking. Always allow for this when towing.  
  • Brakes should not be applied more than very lightly when cornering or travelling around a  curve, particularly when the road is wet or slippery.   Reversing a trailer can be difficult and requires extra care and practice. Directions from an outside observer watching the rear of the trailer can be helpful. 
  • Trailers reduce a towing vehicle’s performance therefore greater care is needed when overtaking.
  • Accelerator, brake and steering must be operated smoothly when towing. Unnecessary steering wheel movement should be avoided because sway or “snaking” of the vehicle and trailer can result. If sway occurs the trailer brakes should be applied gently if they can be operated separately from the towing vehicle, otherwise a steady speed or slight acceleration should be maintained, if possible, until the sway ceases. The tow vehicle’s brakes should only be applied as a last resort. 
  • Drivers must heed any “Dangerous Crosswinds” signs. Road Authorities install these signs in areas where wind gusts can affect the stability of caravans. Reduce your speed accordingly. When travelling downhill with a trailer or caravan, a lower gear should be engaged. This gives you greater vehicle control and reduces the load on your brakes.  
  • Ensure your mirrors on both sides of your towing vehicle are properly adjusted to give a clear view of vehicles approaching from the rear.  
  • To avoid a build-up of following traffic that is unable to overtake, consider pulling off the road where suitable to allow the faster traffic to clear Towing requires more knowledge and skill than normal driving. It can be more stressful and is likely to cause the early onset of fatigue. Be sure to plan your trip, get plenty of rest before embarking, and take regular breaks to avoid fatigue. 
  • Remember, the correct matching of the towing vehicle and the trailer or caravan is essential for safe towing. Check your vehicle handbook and consult your vehicle, trailer and caravan dealers on all towing performance and safety aspects  


Dealing with Trucks 

Encounters with road trains and other large trucks are inevitable for anyone driving in the country. To ensure these encounters are as safe as possible you should:

  • Only overtake if the road is clear and visible a long way ahead (at least 1km - even more  if towing). Once you have made the decision to pass, do so quickly and positively. 
  • Be ready for the effect of wind buffeting as you pass a truck. 
  • Remember that the stopping ability of a heavy vehicle is not the same as a standard car. 
  • Not attempt to overtake a large truck near an intersection - they often require two lanes to turn a corner. 
  • Slow down and move as far left as practical when meeting a road train or other heavy vehicle on a narrow bitumen road. This will prevent flying debris and dust from the 


 Learn more about WA towing Laws IB - 107 - Safe Towing (transport.wa.gov.au) 


Don't guess your weights, weigh your rig to be safe, sure and legal. Protect yourself, protect your family and protect those around you. Call SW Weigh now and we will help you out.


Enjoy your holiday with peace of mind.

all those weight accronyms

Education is vital for Safety First! 

Please reach us at Admin@SWWeigh.com.au if you cannot find an answer to your question.

TARE mass  is the manufactured weight of a vehicle or a caravan. 

For a vehicle it includes oils and fluids and usually 10L of Fuel.

If you add any extras to your Vehicle such as a roof rack, tow ball kit, Bull bar, this will come out of your Payload.

For a Caravan it does not include items such as extras such as water, gas, linen. 

If you add any extras  post manufacture to your Caravan such as an additional battery, Solar panels, Tool Box, this will come out of your available Payload.


ATM is your Aggregate Trailer Mass

ATM is the maximum permissible weight of your caravan when loaded and without being hitched to your towing vehicle.  This includes your payload and TBM.

The ATM is specified by the Trailer Manufacturer and cannot be exceeded.


Actual GTM + TBM = Actual ATM



GTM is your Gross Trailer Mass

GTM is the maximum permissible weight of your caravan, when loaded, whilst hitched to your towing vehicle.



GVM is your Gross Vehicle Mass

GVM is the maximum permissible weight of your towing vehicle when loaded.

This is specified by your Vehicles manufacturer. This includes the weight of your caravan on the Tow Ball when the vehicle is hitched to the caravan.



GCM is your Gross Combination Mass

GCM is the total weight of your Tow Vehicle and Caravan when hitched and fully loaded. 

The GCM is the rating provided by the manufacturer of the tow vehicle. It cannot be exceeded.

Actual GVM + GTM = Actual GCM



TBM is your Tow Ball Mass (or Tow Ball Weight)

TBM is the actual weight imposed on the tow vehicle by the Caravan.

Your Compliance plate on the Caravan may have a Tow Ball Mass TARE. This is the tow ball weight unladen from the factory.



Payload is the amount of weight you can put in a vehicle and / or caravan in Kg's.

Your Caravan will have a payload and your vehicle will have a payload.

Vehicle Payload = GVM - TARE Weight

Caravan Payload = ATM - TARE Weight



GAWR is your Gross Axle Weight Rating or GAW Gross Axle Weight. 

This is the maximum load that your vehicle's front and rear axles can carry as specified by the manufacturer. You will usually find these figures in the owner's manual. 

Your front and rear axles will usually have different ratings and its important not to each axle's weight rating. This is where we can assist with weighing your vehicle and help distribute weight.  


When you book a weigh with us, we provide you with information and definition sheets so that you can easily interpret your weights. We strongly believe in arming you and your family with knowledge so that you can continue to make the right decisions and continue to travel safely, well into the future.


We also suggest several articles and have placed the links here:

 (48) Caravan Sway - YouTube 

Getting Your Caravan's Weight Distribution Right | RAC WA 

Vehicle weights explained | tare, kerb, GVM, payload and trailer figures | CarsGuide 

https://www.4wdingaustralia.com/4x4/a-simple-towing-guide-for-keeping-your-4wd-and-trailer-weight-compliant/

Calculating Your Car and Caravan Towing Limits | RAC WA 

(48) Caravan Sway Crash - YouTube 



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