Protecting critical traffic management systems with FILOform cable joints

The challenge

When a busy urban junction began experiencing repeated faults with its traffic lights, the cause was quickly traced to cable connections.

Low voltage cables had been connected to the traffic control cabinet using poorly insulated joints. Over time, moisture ingress and inadequate protection led to failures in the connections.

The consequences were immediate and highly visible:

• Traffic lights at the junction went down, creating congestion and confusion
• Maintenance crews were forced into repeated, reactive callouts
• Safety risks increased for both motorists and pedestrians at peak travel times

For the local authority, the impact was both operational and reputational. With pressure (and recurring maintenance costs) mounting, our client needed a jointing solution that could deliver long-term reliability in demanding roadside conditions.

The solution

FILOform worked with the contractor to supply our FiloSlim LV resin cable jointing system. FiloSlim LV is trusted around the globe and has been used for decades in traffic engineering across the UK and Europe.

Designed specifically for low voltage applications such as traffic signalling and street lighting, FiloSlim LV combines a compact form with proven performance.

Key advantages included:

• Watertight and durable – The filled resin provides complete insulation and protection, safeguarding cable connections against moisture, corrosion, and mechanical stress.
• Slim profile – Its space-saving design makes it ideal for tight roadside installations, reducing excavation requirements and keeping joints neat within cabinets and chambers.
• Fast installation – The solution is designed to enable consistent curing and dependable insulation, while minimising installer error and speeding up on-site work.
• Versatility – Suitable for inline and branch connections, the same jointing system can be used for traffic lights, street lighting, and other low voltage infrastructure.

The results

By replacing the faulty joints with FILOform’s FiloSlim LV, the project team achieved:

Increased reliability

Cable joints now deliver long-term insulation and water protection, ensuring continuous operation of critical traffic control systems.

Reduced maintenance

With fewer failures and faults, the local authority has minimised costly callouts and disruption.

Improved public safety

Reliable traffic light operation reduces the risk of accidents, protecting both road users and pedestrians.

Invisible but essential performance

Though unseen by the public, the cable joints provide a vital role in keeping traffic flowing smoothly.