The Rural Access Index (RAI) is a measure of access, developed by the World Bank in 2006. It was adopted as Sustainable Development Goal (SDG) indicator 9.1.1 in 2015, to measure the accessibility of rural populations. It is currently the only indicator for the SDGs that directly measures rural access.The indicator relies on three major items of geospatial data: population, road network location and the "all-season" status of those roads. The RAI measures the proportion of the rural population that lives within 2 km of an all-season road, as defined below from the original World Bank study that initiated the RAI:

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