Iowa City has a goal of achieving the League of American Bicyclist (LAB) Gold Level in the Bicycle Friendly Community Program by the end of 2017. LAB has provided general guidelines of the measures required to get to Gold. The document can be downloaded here.
Average Annual Daily Traffic (AADF) maps are published by Iowa DOT. These maps are very useful planning bicycle routes, determining which traffic enhancements are possible and history of traffic patterns because several years data are posted. Maps for the state, counties and cities are here.