The TRRL high speed monitor: Evaluation of performance in hot ambient conditions in Turkey

The High Speed Road Monitor (HSRM) is a computer controlled, vehicle mounted system for measuring the road surface characteristics of profile, wheel-track rutting and macro-texture at normal traffic speeds. The HSRM is being used increasingly for checking the profile of new and repaved roads and for monitoring the condition of in-service roads. The purpose of this evaluation was to monitor the performance of the HSRM in temperatures above those normally experienced in UK, prior to its wider application, particularly overseas. The equipment was operated in southern Turkey in ambient shade air temperatures of up to 35 degrees centigrade. Profile, rutting and macro-texture measurement runs were carried out by the HSRM on a series of road test sections. The measurements were repeated using manual survey techniques and the results were compared. Prior to the evaluation the HSRM was fitted with an air conditioning system. The requirement for and performance of this installation were assessed. Close correlation was obtained between the HSRM and physical survey results. Air conditioning was found to be unnecessary for equipment operation in the temperatures experienced, however it was desirable for operator comfort. (A)