Road Roughness Is Measured Using Which Instrument

A measure road roughness data by direct measurement of the longitudinal profile of the road.

Road roughness is measured using which instrument.

Road surface textures are deviations from a planar and smooth surface affecting the vehicle tyre interaction. This performance measure has less stochasticity and subjectivity in comparison to other pavement performance. The iri was developed in 1986 using the results of the international road roughness experiment performed in brazil in 1982. A roughness tester shows the measured roughness depth rz as well as the mean roughness value ra in micrometers or microns µm.

The main advantages of the iri are that it is stable over time and transferable throughout the world. The international roughness index iri is the roughness index most commonly obtained from measured longitudinal road profiles it is calculated using a quarter car vehicle math model whose response is accumulated to yield a roughness index with units of slope in mi m km etc. Pavement texture is divided into. Measuring the roughness of a surface involves applying a roughness filter.

Contact between the instrument and the object being measured e g. Different international standards and surface texture or surface finish specifications recommend the use of different roughness filters. M922 measurement of roughness rutting and texture by laser profilometer. Since then the iri has become a well recognized standard for the measurement of road roughness.