The data collected this summer will not be available until the Spring or Summer of 2011.
Traffic count data is valuable for business planning and for helping local and state government to make programming decisions for maintenance, construction, speed limits, and other policy considerations.
Historical traffic count maps of Average Annual Daily Traffic (AADT) for cities, counties and statewide are available for download from their website, www.iowadotmaps.gov. AADT maps are available for download (as PDFs) for Southeast Iowa for the years 2006, 2002 and 1998. Older paper maps are available for order from the Iowa DOT offices in Ames.
Traffic levels are generally pretty stable around Washington County, with the exception of along the US 218 (Avenue of the Saints) expressway, which is continues to grow rapidly.
| 2006 | 1998 | |
| - Washington Hwy 92 - by Korner Kreamery | 8,300 | 8,000 |
| - US 218, north of Riverside | 16,800 | 11,200 |
| - Hwy 1, north of Kalona | 6,200 | 5,900 |
| - Hwy 92, between Washington & Ainsworth | 3,870 | 4,120 |
The Iowa DOT uses pneumatic tubes laid across a roadway to count traffic on this scale rather than using people or cameras. Its a pretty good system for collecting a lot of data. The Iowa DOT also makes year-round, monthly traffic counts of some locations around the state, including a few key areas around Washington County.
Area businesses or government bodies that was help collecting and interpreting this AADT county data should feel free to contact me, Ed Raber at WEDG. I love working with this data.
