Road Roughness Is Measured Using Which Instrument

Road surface textures are deviations from a planar and smooth surface affecting the vehicle tyre interaction.

Road roughness is measured using which instrument. 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. A measure road roughness data by direct measurement of the longitudinal profile of the road. The main advantages of the iri are that it is stable over time and transferable throughout the world. A roughness tester shows the measured roughness depth rz as well as the mean roughness value ra in micrometers or microns µm.

Contact between the instrument and the object being measured e g. This performance measure has less stochasticity and subjectivity in comparison to other pavement performance. Different international standards and surface texture or surface finish specifications recommend the use of different roughness filters. Road roughness measurement techniques and statndardisation of rtrrms devices.

Since then the iri has become a well recognized standard for the measurement of road roughness. Measuring the roughness of a surface involves applying a roughness filter. Microtexture with wavelengths from 0 mm to 0 5 millimetres 0 020 in macrotexture with wavelengths from 0 5 millimetres 0 020 in to 50 millimetres 2 0 in and megatexture with wavelengths from 50 millimetres 2 0 in to 500 millimetres 20 in. M922 measurement of roughness rutting and texture by laser profilometer.