The Maricopa Association of Governments is tracking the level of traffic volume and the amount of time commuters are stuck in traffic on a daily basis in the region. The traffic volume data is provided by ADOT on selected automatic traffic recorders on freeways and arterial streets in Maricopa county. The measure of congestion delay* is calculated from speed data, which covers all major freeways and some arterial streets in Maricopa County on a daily basis, 24 hours a day. Please note that the graphs below are derived from INRIX data, which 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 travel time data by the analytics company INRIX." The graphs below incorporate the appropriate attributions.