For other metros, cities, counties, etc., do a web search using the location name and traffic volume or count. For example, to search for St. Louis, try St. Louis traffic counts or St. Louis County traffic volume. If you have trouble, please let me know at grayg@missouri.edu.
Check state departments of transportation for traffic volume information. Surf their website and make a phone call if needed to track down the data. As an example, go to Iowa DOT's site for Iowa's maps.
