The Maricopa Association of Governments is tracking the level of traffic volume and the amount of congestion delay time on a continuous basis in the region. Traffic volume trends, both region-wide and at specific locations, are derived from data provided by ADOT from selected automatic traffic recorders on freeways and arterial streets in Maricopa County. The congestion delay measure, both region-wide and for specific corridors, is calculated from INRIX speed data collected continuously across major freeways and some arterial streets in Maricopa County. Please note that the congestion trend graphs below derived from INRIX data are proprietary and require attribution. A single notation within a report that contains INRIX data and a single logo on web pages that draw from INRIX data is acceptable. For example, a reporter could say "according to speed data by the analytics company INRIX." The graphs below incorporate the appropriate attributions.