Nine London Boroughs Roll Out No-Flash Radar Speed Cameras That Catch Drivers in Both Directions

Nine London boroughs are installing a new generation of speed cameras that operate without any visible flash, using 4D radar technology to capture speeding vehicles in both directions of travel regardless of lighting conditions or weather. The cameras, being rolled out across parts of inner and outer London, represent a significant upgrade on the traditional Gatso and Truvelo units that most drivers are familiar with, and raise important questions about how enforcement is changing on UK roads.

Unlike conventional speed cameras, which many drivers have learned to spot from distinctive yellow housings, flash signatures, or roadside warning signs, the new radar-based units can be installed in more discreet housings and operate silently. There is no flash visible to drivers or bystanders, which means the moment of capture is undetectable.

Which Boroughs Are Involved

The rollout covers nine London boroughs in the current phase of the programme. The boroughs included in the first phase span a mix of inner London and suburban locations where road safety data, casualty statistics, and average speed measurements identified the greatest need for upgraded enforcement.

The specific camera locations within each borough have not all been publicly disclosed in full. Under the Road Traffic Act 1988 and associated guidance from the Department for Transport, local authorities are required to mark speed camera sites with appropriate signage, and the Safety Camera Partnership coordinates with Transport for London and the Metropolitan Police to ensure compliance with national guidelines on site marking and driver notification.

Enforcement cameras in England must be painted yellow and accompanied by advance warning signs at permanent sites. The no-flash characteristic of the new radar units does not exempt them from these requirements. However, the absence of a visible flash means that drivers who have previously used flash awareness as an indicator of whether they have triggered a camera will no longer have that signal available.

How 4D Radar Speed Cameras Work

Traditional Gatso cameras use radar to measure speed and a secondary road-based confirmation system (piezo strips or loop detectors in the road surface) combined with a rear-facing flash photography system. The flash serves a dual purpose: it illuminates the vehicle for photography in low light, and it tends to act as a deterrent in itself, since drivers who see a flash know they may have been caught.

The new 4D radar units function differently. They use continuous radar emission that measures vehicle speed across multiple dimensions — hence the 4D designation, which refers to the radar’s ability to track range, velocity, azimuth (horizontal angle) and elevation simultaneously. This multi-dimensional tracking allows the system to reliably separate individual vehicles in dense traffic, measure speeds accurately across multiple lanes, and capture vehicle details in both travel directions from a single unit.

Imaging is handled by high-resolution digital cameras that operate in ambient light conditions and, where necessary, use infrared illumination that is invisible to the human eye. This eliminates the need for a flash entirely. The cameras can capture clear images of number plates and vehicle occupants in darkness, rain, and other adverse conditions that would compromise the reliability of a conventional flash-based system.

The 4D designation also refers to the system’s ability to track a vehicle’s speed over a distance rather than at a single point, providing more accurate speed measurement across different driving scenarios and reducing the potential for successful challenges based on measurement error.

Bidirectional Enforcement

One of the most significant operational differences between the new cameras and older technology is the ability to enforce in both directions of travel from a single installation. Traditional Gatso cameras are rear-facing by design — they capture the rear number plate of vehicles exceeding the limit, which avoids the issue of flash temporarily impairing driver vision. Separate cameras are required to enforce in the opposite direction of travel.

The radar-based system’s reliance on infrared rather than visible-spectrum illumination removes this constraint entirely. A single unit can monitor both carriageways simultaneously, capturing front and rear images without any risk of flash impairment. This doubles the enforcement coverage of each installation and potentially allows local authorities to achieve the same enforcement density with fewer physical units, reducing both capital and maintenance costs.

For drivers, the practical implication is that on a two-way road equipped with these cameras, both directions of travel are being monitored simultaneously. The conventional habit of checking for cameras in only the direction of travel, or assuming that a camera is single-directional, is no longer a reliable assumption.

The Regulatory Framework

Speed enforcement in England is administered through Safety Camera Partnerships, which bring together local authorities, police forces, and highway authorities. In London, the Metropolitan Police Safety Camera Partnership and Transport for London coordinate enforcement across the capital’s road network, with local borough councils funding installations on local roads and TfL managing enforcement on the strategic network.

The legal basis for speed camera enforcement has not changed with the introduction of new technology. Cameras must be approved for use by the Home Office, operated according to type-approval specifications, and subject to regular calibration and quality assurance. Evidence gathered by unapproved or incorrectly operated cameras cannot be used to support a prosecution.

The radar camera systems being deployed in London have received the necessary Home Office Type Approval. This approval process requires the manufacturer to demonstrate that the system measures speed accurately within defined tolerances, captures usable evidence to the required standard, and operates reliably across the range of conditions in which it will be used.

Fixed Penalty Notices for speeding carry a £100 fine and three penalty points as a starting point. For more serious exceedances, cases are referred to the Single Justice Procedure or a court, where fines can reach 175 per cent of weekly take-home pay and disqualification is possible. Speed Awareness Courses remain available as an alternative to fixed penalty points for drivers caught just above the limit for the first time within three years.

Why London Is Prioritising Camera Upgrades

London has one of the highest casualty rates from road traffic collisions of any major European city when measured by total absolute numbers, reflecting both the scale of its road network and its population density. The Mayor of London’s Vision Zero programme, adopted in 2018, sets a target of zero deaths and serious injuries on London’s streets by 2041. Progress towards this target has been slower than hoped, and road safety enforcement is one of several policy levers being used to accelerate it.

Speed is a factor in a disproportionate share of fatal and serious injury collisions. Analysis by Transport for London found that reducing average vehicle speeds by even small amounts produces statistically significant reductions in collision frequency and severity. A pedestrian struck at 40mph is roughly twice as likely to be killed as one struck at 30mph. The relationship between speed and collision outcome is well-established in road safety science and underpins the case for both 20mph zones in residential areas and upgraded speed enforcement technology on higher-speed roads.

The camera upgrade programme is also partly a response to the limitations of ageing camera infrastructure. A significant proportion of London’s fixed speed cameras were installed in the early 2000s, and some units are approaching the end of their operational lifespan. Rather than replacing like-for-like with equivalent technology, the programme takes the opportunity to upgrade to more capable systems with lower long-term maintenance requirements.

Average Speed Camera Coverage Is Also Expanding

The point-based radar cameras being installed in the nine boroughs are part of a broader expansion of speed enforcement technology across London. Average speed camera systems — which measure how long a vehicle takes to travel between two or more points and calculate the average speed over that distance — have been operating on several key routes for several years, and further expansion is planned.

Average speed enforcement is widely considered more effective as a speed-reduction tool than point cameras, which can be evaded by braking before the camera and accelerating afterward. On routes where average speed cameras are active, sustained speed compliance is required for the entire monitored section, which changes driver behaviour more fundamentally.

The combination of point-detection radar cameras at junctions and hazard locations, average speed systems on longer stretches, and the expanding London Safety Camera network creates a more comprehensive enforcement environment than existed even five years ago.

What This Means for London Drivers

For drivers who travel regularly on London roads, the practical implications are significant. The no-flash characteristic of the new cameras removes one of the informal cues that some drivers have used to assess whether they were captured. This should not change the behaviour of drivers who maintain legal speeds regardless, but it does close an evasion window that existed with older technology.

The bidirectional capability means that locations which previously appeared to have only one-directional enforcement may now have cameras monitoring both ways. Again, this matters primarily to those driving above the speed limit, but it is worth understanding as the camera landscape changes.

Awareness of the camera network remains important. Transport for London publishes information about safety camera sites, and the AA and RAC maintain databases of known fixed camera locations that are reflected in satellite navigation and speed warning applications. These databases are updated as new sites are commissioned, and drivers who rely on satnav speed camera alerts should ensure their maps and firmware are current.

The broader direction of travel is clear: speed enforcement in London is becoming more technologically capable, more geographically comprehensive, and less detectable by conventional driver awareness. Compliance with posted speed limits — rather than awareness of camera locations — is the only reliable approach to avoiding enforcement action.

Sources:

• RAC Drive: London boroughs roll out no-flash radar speed cameras
• Transport for London: Speed cameras
• GOV.UK: Speed limits