rroad: Road Condition Analysis
Computation of the International Roughness Index (IRI) given a
longitudinal road profile. The IRI can be calculated for a single road segment
or for a sequence of segments with a fixed length (e. g. 100m). For the latter,
an overlap of the segments can be selected. The IRI and likewise the algorithms
for its determination are defined in Sayers, Michael W; Gillespie, Thomas D;
Queiroz, Cesar A.V. 1986. The International Road Roughness Experiment (IRRE) :
establishing correlation and a calibration standard for measurements. World
Bank technical paper; no. WTP 45. Washington, DC : The World Bank. (ISBN
0-8213-0589-1) available from <http://documents.worldbank.org/curated/en/326081468740204115>.
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