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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.).
Some of the most well-known performance indicators are Pavement Condition Index (PCI), International Roughness Index (IRI) and Present Serviceability Index (PSI), [3] [4] but sometimes a single distress such as rutting or the extent of crack is used.
The present serviceability index (PSI) is a pavement performance measure.Introduced by the American Association of State Highway and Transportation Officials (AASHTO), the PSI is one of the most widely used pavement performance indicators after pavement condition index (PCI) and international roughness index (IRI).
Pavement engineering is a branch of civil engineering that uses engineering techniques to design and maintain flexible and rigid pavements.This includes streets and highways and involves knowledge of soils, hydraulics, and material properties.
These include transversal road profile, macro-texture measurements, longitudinal profile, rut depth, rut width, cross fall, curve radius, cracks, International Roughness Index (IRI), [citation needed] mean profile depth, vehicle speed, position relative to the start point, GNSS position, together with pavement imaging and time-stamping of measurements.
The pavement condition index (PCI) is a numerical index between 0 and 100, which is used to indicate the general condition of a pavement section.The PCI is widely used in transportation civil engineering [1] and asset management, and many municipalities use it to measure the performance of their road infrastructure and their levels of service. [2]
U.S. President Donald Trump signs documents as he issues executive orders and pardons for January 6 defendants in the Oval Office at the White House on Inauguration Day in Washington, U.S ...
Road surface textures are deviations from a planar and smooth surface, affecting the vehicle/tyre interaction. Pavement texture is divided into: 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).