In the UK, authorities prioritize maintaining road safety, especially for heavy goods vehicles (HGVs) and their trailers. One key aspect of this safety regime is the annual trailer MOT test just like HGV MOT test, which ensures that these essential components of HGVs meet the necessary standards to operate safely on public roads. In this blog, we’ll explore what the trailer MOT test is, what it involves, when you need it, and why it’s so important for both safety and legal compliance.
Trailer MOT: What is it?
The trailer MOT test is an annual inspection that the law requires to ensure trailers are safe and roadworthy. Just like the MOT for cars, this test checks that the trailer meets road safety standards set by the Driver and Vehicle Standards Agency (DVSA). This test is crucial for all trailers used in commercial settings, particularly those attached to HGVs.
The MOT test for trailers goes beyond basic safety checks like brakes and lights. It includes a thorough evaluation of the trailer’s structure, load-bearing capabilities, suspension, coupling equipment, and more. This step ensures the trailer is fit for purpose and doesn’t pose a danger to the driver or other road users.
Does a trailer need an MOT
In the UK, not all trailers need an MOT. However, the trailer MOT is mandatory for:
- Trailers over 1,020kg (unladen weight), including both rigid and articulated trailers used with HGVs.
- HGVs used for commercial purposes, such as transporting goods or passengers for hire or reward.
For new trailers, the first MOT is required after four years of use. After that, you must get the trailer MOT checked annually, just like the HGV itself. This ensures both the vehicle and its trailer remain compliant with road safety standards.
MOT check trailer
The trailer MOT includes a series of checks designed to ensure the trailer meets safety standards required for road use. These checks typically cover the following areas:
- Braking System
- Inspect the condition of the brake pads and their wear.
- Check the proper brake operation, including the air brake system if applicable.
- Test the handbrake performance to ensure the trailer remains stationary when applied.
- Suspension and Chassis
- Inspect for cracks, damage, or excessive corrosion on the trailer’s frame and structure.
- Ensure suspension components are free from damage or excessive wear to maintain stability.
- Lights and Electrical Systems
- Verify that all necessary lights (indicators, brake lights, number plate light) are operational and meet visibility requirements.
- Ensure the electrical system, including the connection between the trailer and the HGV, functions properly so all lights and signals work.
- Tyres and Wheels
- Check that the tyres meet the minimum tread depth (1.6mm) and are free of defects like bulges or excessive wear.
- Ensure the wheel bearings are secure and in good condition to avoid wobbling.
- Coupling Mechanism
- Verify that the tow bar and hitch mechanism are secure, free from wear, and in good working order.
- Ensure the locking mechanism functions correctly to prevent the trailer from detaching while in transit.
- Load Securing and Bodywork
- Ensure adequate load restraint systems are in place to prevent cargo from shifting or falling off during transport.
- Inspect the trailer’s body, including doors, flooring, and internal mechanisms, to ensure it supports the load safely.
- Additional Features
- Check that side markers and reflectors are present and visible, especially in low-light conditions.
- Inspect air suspension systems (if fitted) for leaks and proper operation.
Preparing for the Test
Preparing for your trailer MOT involves ensuring all components are in good working order. Here are some tips to help you get your trailer ready:
- Visual inspection: Check for visible signs of damage or wear, such as cracks in the chassis or worn-out tyres.
- Functional test: Ensure all lights and brakes work, and test the coupling mechanism to make sure it is secure.
- Tire and wheel check: Check that the tyres are in good condition, have sufficient tread, and properly inflate.
- Load securing: Securing the cargo to prevent shifting during transit.
What Does the Trailer MOT Test Cost?
The cost of a trailer MOT test can vary depending on several factors, including the trailer’s size, weight, and the testing centre’s location. On average, the cost for a standard MOT trailer test ranges from:
- £41 to £64 for standard trailers (up to 3.5 tonnes).
- £50 to £70 for larger trailers (over 3.5 tonnes).
- £70 to £100 for articulated trailers or those with complex systems (such as air suspension).
These prices are approximate and can vary by region or depending on any additional services, such as a retest fee if the trailer fails its initial inspection.
Factors Affecting the Cost
Several factors can influence the price of a trailer MOT, including:
- Size and weight: Larger trailers with more complex systems take longer to inspect, increasing the cost.
- Location: Prices may vary by region, with testing centres in larger cities potentially charging higher rates.
- Additional checks or repairs: If your trailer needs repairs during the MOT, this can add to the overall cost.
Check MOT trailer HGV
The UK government provides an online service where you can check the MOT status and history of a vehicle, including trailers and HGVs. Here’s how to do it:
- Visit the official MOT history website.
- For trailers, use the registration number of the towing vehicle (the HGV or truck) to check the status of the trailer’s MOT.
- The system will show you the MOT status and details of any previous MOT tests (e.g., pass or fail, advisories, test date).
FAQs
While all HGV trailers require an MOT if they meet the weight threshold, the rules are different for smaller trailers.
No, since it is quite difficult for it to be loaded and then unloaded during test.
Yes, trailer electrics are checked during the MOT test. This includes the electrical system that connects the trailer to the towing vehicle. You must ensure that all lights—indicators, brake lights, rear reflectors, and number plate lights—are fully functional and meet visibility requirements. A failure in the trailer’s electrical system is one of the more common reasons trailers fail their MOT.
You can check your trailer’s MOT on UK government’s website.
If your trailer weighs under 1,020kg (unladen weight), it doesn’t require a formal MOT. However, you still need to ensure it is roadworthy, and regular maintenance and checks are necessary to ensure safety.
Conclusion
The trailer MOT test is essential for ensuring the road safety of trailers used with HGVs. Whether you’re a commercial operator or a fleet manager, regular MOT checks help you comply with legal requirements, maintain your trailer’s safety, and avoid costly fines or accidents. By staying on top of maintenance and scheduling annual trailer MOT tests, you ensure your trailer remains safe, roadworthy, and legally compliant.
Remember, trailers aren’t just accessories to HGVs—they are crucial components of the vehicle’s overall safety and efficiency. Keep your trailer in top condition, and it will serve you well on the road for years to come.