A new generation of radar-based speed cameras that do not flash has begun rolling out across London.

It marks a significant shift in how speeding offences are detected, potentially signalling a wider change across the UK.

This is the latest technological development in roadside camera systems since their introduction on UK roads 30 years ago.

Capital smiles

The technology, being trialled by Transport for London in partnership with the Metropolitan Police, is being installed at up to 10 sites across the capital, including boroughs such as Croydon, Hackney and Tower Hamlets.

Unlike traditional speed cameras, which often rely on road markings and a visible flash to capture offences, the new systems operate almost invisibly.

Using advanced 4D radar and high-resolution 4K cameras, they can detect speeding vehicles across multiple lanes without alerting drivers at the time.

The cameras represent a major upgrade on existing “spot speed” systems.

Rather than relying on sensors embedded in the road surface, the new devices use radar to track a vehicle’s speed, position and direction in real time.

Each unit can monitor up to five lanes of traffic in both directions simultaneously, significantly more than older cameras, which typically cover fewer lanes and require physical infrastructure beneath the road.

Crucially, the absence of a flash or visible warning means drivers may not realise they have been caught speeding until they receive a penalty notice later.

Smarter safety

Officials say safety concerns drive the move.

Speeding remains one of the leading causes of serious road collisions, and a contributing factor in around half of fatal incidents in London in recent years.

The trial forms part of the capital’s “Vision Zero” strategy, which aims to eliminate deaths and serious injuries on London’s roads.

By improving enforcement, authorities hope to deter dangerous driving and encourage better compliance with 20mph and 30mph limits, where risk to pedestrians is highest.

Police and transport officials also argue that clearer, higher-quality images will strengthen prosecutions and reduce disputes over offences.

Encouraging change

Supporters of the technology highlight several advantages.

First, the increased coverage means fewer cameras are needed to monitor large areas of road, potentially improving efficiency and reducing installation costs.

Second, the systems are described as more reliable, as they do not depend on road sensors that can wear out or require maintenance.

Perhaps most importantly, authorities believe the lack of visible cues could change driver behaviour. Instead of slowing only when a camera is spotted, motorists may be encouraged to stick to speed limits more consistently.

Road safety groups have also suggested the technology could help tackle poor compliance with urban speed limits, particularly in residential areas.

However, the rollout has not been without controversy.

Critics argue that removing the traditional flash reduces transparency and could feel punitive, with drivers unaware they have committed an offence.

There are also concerns that “stealth” enforcement undermines the original purpose of speed cameras, which was partly to serve as a visible deterrent.

Others warn that public acceptance will be key, particularly if the technology expands beyond London.

Track record

Speed cameras have been used in the UK for over 30 years, with their introduction dating back to the early 1990s.

The first fixed speed camera was installed in 1992 on the A316 road in Twickenham, London, in response to growing concern about rising road deaths and as part of an effort by police and transport authorities to find more effective ways to enforce speed limits.

Early systems were based on Gatso cameras, developed by the Dutch company Gatsometer BV.

These used radar to detect speed and a distinctive bright flash to photograph vehicles, quickly becoming a familiar sight on UK roads throughout the 1990s.

During the late 1990s and early 2000s, the use of speed cameras expanded rapidly under government road safety programmes.

The introduction of the National Safety Camera Programme in 2000 accelerated deployment, with thousands of fixed and mobile cameras installed across the country.

This period also saw the introduction of average-speed cameras, such as the SPECS system, which measure a vehicle’s speed over a longer stretch rather than at a single point, and are commonly used for motorway roadworks areas.

While speed cameras have been credited with helping reduce road casualties, particularly in high-risk areas, they have also remained controversial, with debates over whether they are primarily a safety tool or a revenue generator.

Pilot scheme

While currently limited to London, officials have indicated that a wider rollout of the new technology is possible.

TfL says the trial will be closely monitored, and if successful, similar systems could be deployed more broadly across the UK.

With millions of speeding offences recorded annually nationwide and ongoing pressure to reduce road deaths, experts believe other regions may follow suit if the technology proves effective.