PAS 2161 Road Condition Monitoring Trials 2025 Report

Published: Feb 2026

Citation: 10.58446/ixuc7153

ISBN:

Author: Ben Muller, Stuart Brittain, Craig Thomas, Warsame Mohamed, Robin Workman

Pages: 39

Reference: PPR2083

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In 2023, the Department for Transport (DfT) worked with TRL to develop and trial a demonstration process for approving new Road Condition Monitoring (RCM) technologies, building on an earlier comparability study in Surrey. Trials were conducted across representative networks in Cumberland, Essex and Liverpool, with data collected over staggered four-week periods by both technologies and 19 road engineers. Engineers reported condition in accordance with PAS 2161, and the modal engineer rating formed the benchmark for performance assessment. Technologies also completed repeat surveys on specified sub-routes to assess measurement consistency. Around 20% of high-agreement engineer data were shared for calibration, with the remainder reserved for evaluation. Performance was assessed using statistical measures including precision, accuracy and chi-squared tests. Following a second calibration to improve alignment, a provider benchmark was established to assess inter-technology agreement. Applying defined pass criteria for accuracy and repeatability, nine technologies were approved for network use.

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