Traffic counts can be useful tools for many purposes. They help transportation planners understand roadway volume and changes in volumes over time. Developers can use them to evaluate prospective sites. You can find some traffic counts on this website and links to other helpful sites here as well.
INDOT Traffic Counts
The Indiana Department of Transportation maintains an online database of traffic counts, which includes traffic counts the Indianapolis MPO has completed/contracted for in the past few years. The map is interactive and they provide search options if you need them.