PAS 2161 Road Condition Monitoring Trials Report 2025

This document is a published project report detailing the trials conducted for Road Condition Monitoring (RCM) under PAS 2161. The report outlines the collaboration between the Department for Transport (DfT) and TRL in 2023, which aimed to assess the comparability of new RCM technologies. The trials were executed on roads in Surrey, where a methodology for comparing RCM categories was established. The report describes the demonstration process for approving technologies that report road conditions, which involved data collection along predetermined routes across three Local Authorities: Cumberland, Essex, and Liverpool. The report also details the statistical analyses performed to evaluate the performance of the technologies against a benchmark dataset constructed from road engineers' assessments. The criteria for technology approval are specified, leading to the identification of nine technologies that successfully passed the demonstration process. The report concludes with a list of these technologies and their approved status for use on the road network until March 2027.