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.

A roughness tester shows the measured roughness depth rz as well as the mean roughness value ra in micrometers or microns µm. 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. The iri was developed in 1986 using the results of the international road roughness experiment performed in brazil in 1982. This performance measure has less stochasticity and subjectivity in comparison to other pavement performance.

The work to be executed under this specification consists of collecting data using a laser profiler to. Since then the iri has become a well recognized standard for the measurement of road roughness. 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. Different international standards and surface texture or surface finish specifications recommend the use of different roughness filters.

Pavement texture is divided into. Measuring the roughness of a surface involves applying a roughness filter. Road surface textures are deviations from a planar and smooth surface affecting the vehicle tyre interaction. The main advantages of the iri are that it is stable over time and transferable throughout the world.