Abstract

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Title:: Calculation error analysis of detecting lateral offset vehicle wandering on rut depth

Author(s):: HUI Bing; LI Tian-tian; WANG DI; (1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, China; 3. School of Information Engineering, Chang’an University, Xi’an 710064, Shaanxi, China)

Keywords:: road engineering; rut; detection; vehicle lateral offset; error analysis

Abstract:: In order to study the impact of vehicle lateral offset on the rut depth, transverse rut profiles were established based on 13 point laser data. Through MATLAB programming, the vehicle lateral offset was simulated. Absolute errors and relative errors of rut depth before and after vehicle wandering were used as indexes to analyze the changing law and reason of rut depth errors with low and high severity levels when lateral offset happens in different directions and with different distances. The results show that with the distance of vehicle lateral offset increases, the value of absolute and relative errors will become as much as 6.4 mm and 29% respectively. The depth absolute error resulted from lateral offset will underestimate rut severity levels, and may lead to the mistake of road condition assessment and pavement maintenance decision. The degree of rut depth errors are mainly influenced by the location of deeper rut, rut slop and hump width/height. Therefore, the vehicle lateral offset should be detected in the direction of deeper rut and bigger slope so as to obtain the shape of deeper rut and then minimize the impact of vehicle lateral offset on rut depth measurement accuracy.