Marker lights on HGV Trucks
Marker lights, also known as marker lamps, are an essential part of keeping your HGV or LGV truck visible to other drivers and keeping you and other road users safe. Although some road users may not fully understand their importance, marker lights play a crucial role in keeping HGV trucks visible in the dark and alerting other drivers to the vehicle ahead of them, particularly in areas with little to no street lighting.
For fleet operators and drivers alike, understanding how marker lights work, how to check them properly, and the legal requirements surrounding their use is essential for staying compliant and avoiding unnecessary fines or safety risks on the road.
What Are Marker Lights and Why Do They Matter?
Marker lights are small lamps fitted along the sides and rear of an HGV or trailer, designed to outline the shape and size of the vehicle to other road users. Unlike headlights or brake lights, their purpose isn't to illuminate the road ahead, but rather to make the vehicle's dimensions clearly visible, especially at night or in poor visibility conditions such as fog or heavy rain.
Given the sheer size of most HGVs and trailers, other drivers need a clear indication of exactly where the vehicle begins and ends. Without properly functioning marker lights, other road users may misjudge the length or width of a truck, increasing the risk of collisions, particularly when overtaking or merging on motorways and dual carriageways.
How to Check Your Marker Lights
Marker lights are a vital safety feature for night-time driving, and you must make sure to check that they're working before every journey. The UK government recommends daily HGV walkaround checks covering each part of your vehicle, and marker lights should always be included as part of this routine.
Here's how to check your marker lights properly:
- Check that your marker lights work. With the engine running, the marker lights should illuminate automatically. If any of the LED lights within the marker unit aren't working, the vehicle is not roadworthy, as this goes against UK rules and regulations.
- Check that the marker lenses are clean and properly fitted. If any lenses are loose, they'll need repairing or replacing promptly. If any are obstructed by dirt, grime, or road debris, they must be cleaned immediately, as failing to comply with these regulations can result in a substantial fine if you're caught driving with obscured or non-functioning marker lights.
It's worth making these checks part of your standard pre-journey routine, alongside checks on tyres, brakes, and other essential safety components. A quick visual inspection each morning can save considerable time, money, and hassle further down the line.
Rules and Regulations for HGV Marker Lights
The government has set clear rules and regulations regarding the legal requirements for the position and colour of marker lights. Every HGV driver and fleet operator must ensure they abide by these rules to remain compliant and roadworthy.
Side Marker Lights
Trailers and new goods vehicles over six metres in length must be fitted with amber-coloured side marker lamps positioned along the side of the vehicle body. There must be a three-metre gap between each marker light, with the vehicle typically requiring at least three marker lights on each side. Where a three-metre spacing isn't possible, a four-metre gap is also permitted.
The only exception allowing a side marker light to be a different colour is if it's positioned within one metre of the rear of the vehicle or trailer. In this case, the marker light should be red rather than amber. It's also permitted for the rear end-outline marker light to double up as the rear-most side marker light, provided it's the correct colour and positioned correctly.
End-Outline Marker Lights
Trailers over 2.1 metres in width are required to be fitted with end-outline marker lights. According to the HGV inspection manual, the front end-outline marker light should be white, whilst the rear end-outline marker light should be red.
The manual also states that both the front and rear end-outline marker lights should be positioned as high as possible on the vehicle. This ensures that drivers approaching from behind, or those positioned in front of the vehicle, can see the lights clearly from a distance, giving them a better understanding of the vehicle's size and position on the road.
Important Notes on Compliance
It's important to note that a position lamp must never be used as a substitute for a marker light. If a marker light is faulty or missing, a separate, correctly specified marker lamp must be fitted in its place rather than relying on other lighting to fulfil this role.
Failing to meet these requirements isn't just a legal risk. It also compromises the safety of your vehicle, your drivers, and other road users, particularly during night-time driving or in poor weather conditions where visibility is already reduced.
Common Marker Light Faults to Watch For
Beyond daily walkaround checks, it's worth being aware of the common issues that can affect marker light performance over time:
- Cracked or discoloured lenses reducing light output
- Water ingress causing internal corrosion or short circuits
- Loose wiring connections leading to intermittent faults
- Vibration damage from long-distance or off-road driving
- General wear from prolonged exposure to weather and road debris
Regularly inspecting marker lights for these issues, and replacing any damaged units promptly, helps maintain compliance and reduces the risk of a light failing unexpectedly whilst out on the road.
Conclusion
Marker lights may be a small component of your HGV, but they play a significant role in road safety, particularly during night-time driving and in low-visibility conditions. Understanding the rules around positioning, colour, and spacing, alongside carrying out regular checks as part of your daily walkaround routine, helps keep your fleet compliant and your drivers safe.
TruckSpares365 stocks a comprehensive range of high-quality marker lights and lighting components for HGVs and trailers, helping you stay compliant with UK regulations and keep your vehicles clearly visible on the road, whatever the conditions.
