TY  - JOUR
PY  - 2008//
TI  - Indicators of longitudinal unevenness of roads in the USA
JO  - International journal of vehicle design
A1  - Kropac, Oldrich
A1  - Mucka, Peter
SP  - 393
EP  - 415
VL  - 46
IS  - 4
N2  - About 25,800 longitudinal profiles of in-service roads in the USA (Long-Term Pavement Performance (LTPP) Program) were evaluated to obtain indicators of the longitudinal unevenness (roughness) of the road surface defined by standards ISO 8608 : 1995 and EN 13036-5 : 2006. Besides the commonly used International Roughness Index (IRI), also parameters of the Power Spectral Density (PSD) were evaluated taking into account not only the whole interval of effectively acting wavelengths, but also its two and three partial sub-bands. Differences between left and right tracks and between Asphalt Concrete (AC) and Portland Cement Concrete (CC) wearing courses were considered. For all the mentioned indicators (21), their Probability Density Functions (PDF) and numerical statistics were estimated.<p />
LA  - en
SN  - 0143-3369
UR  - http://dx.doi.org/10.1504/IJVD.2008.020306
ID  - ref1
ER  -