DfT Launches Independent Review After HADECS Speed Camera Issue

The Department for Transport (DfT) has launched an independent review following a technical anomaly affecting some National Highways Digital Enforcement and Compliance System (HADECS) cameras on certain A-roads and motorways.

The issue caused occasional delays between cameras and variable speed limit signs, leading to a small number of drivers being incorrectly detected as speeding after limits had changed. While the total number of errors is limited—affecting 154 cameras across 10% of the Strategic Road Network (SRN) and resulting in around 2,650 erroneous activations since 2021—National Highways has acted to ensure no further incorrect enforcement takes place.

To prevent additional errors, National Highways instructed its camera supplier to pause the transfer of variable speed data to police forces in October 2025. A Home Office-approved solution has now been agreed, and the system is being updated.

Independent DfT Review

In a ministerial statement on 16 December 2025, the DfT confirmed an independent investigation would examine how the technical anomaly occurred and ensure lessons are learned. The review is being led by Tracey Westall OBE, Non-Executive Director of DfT, and will focus on governance, oversight, and accountability.

The review will:

• Establish the cause of the HADECS anomaly, how it was detected, and whether earlier identification or prevention was possible.

• Examine how the issue was escalated internally within National Highways, including communications with the board and executive.

• Assess National Highways’ governance, response processes, and accountability for technical and operational issues.

• Make recommendations for improvements to governance, supplier management, and operational procedures to prevent similar issues in the future.

The review is explicitly not intended to assign blame or determine disciplinary action against any individuals. Sensitive or confidential information will only be shared as necessary to meet the review’s objectives.

Scope of the Review

The DfT review will cover:

• How technical and operational issues, including HADECS, are identified and escalated within National Highways.

• Executive and board decision-making and response to these issues.

• Oversight of suppliers during the development, testing, and implementation of HADECS cameras and other SRN technology.

• The effectiveness of processes for applying lessons learned from previous technical or operational incidents.

National Highways said the review will help strengthen governance and ensure that the deployment of technology across the SRN meets the highest standards of accuracy and reliability, restoring public confidence in enforcement systems.