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Traffic Volume

The dashboard provides two traffic volume measures. One is the average count of vehicles per meter per day and the other is the total traffic volume passing a point or segment of a highway facility in both directions, known as Annual Average Daily Traffic (AADT). The higher traffic volume can lead to higher exposures to ambient noise, toxic gases, and particulate matter, including diesel particulates associated with various health impacts for residents. These include, but are not limited to, respiratory diseases, cardiovascular disease, stress, and poorer health outcomes.

Data Notes
Definition	Average Vehicle per Meter per Day: The average count of vehicles per meter per day within 500 meters of a census block centroid (the center point of a census block), divided by distance in meters, presented as the population-weighted average of blocks in each county. Annual Average Daily Traffic (AADT): The AADT is the total traffic volume passing a point or segment of a highway facility in both directions of travel for one year divided by the number of days in the year.
Data Source	County Health Ranking and Roadmaps (Vehicles per Meter per Day); S.C. Department of Transportation, Traffic Counts (AADT)
Last Updated	April 2024