Iowa Vehicle Registrations Statistics, January 1, 1999

Iowa vehicle registration statistics by county and vehicle type produced by Iowa Department of Transportation

2000 Vehicle Registrations Summary, May 23, 2001

Iowa vehicle registration statistics by county and vehicle type produced by Iowa Department of Transportation

2001 Vehicle Registrations Summary, June 7, 2002

Iowa vehicle registration statistics by county and vehicle type produced by Iowa Department of Transportation

2004 Vehicle Registrations Summary, December 22, 2005

Iowa vehicle registration statistics by county and vehicle type produced by Iowa Department of Transportation

2005 Vehicle Registrations Summary, March 5, 2008

Iowa vehicle registration statistics by county and vehicle type produced by Iowa Department of Transportation

2009 Vehicle Registrations Summary, June 24, 2010

Iowa vehicle registration statistics by county and vehicle type produced by Iowa Department of Transportation

2010 Vehicle Registrations Summary, March 23, 2011

Iowa vehicle registration statistics by county and vehicle type produced by Iowa Department of Transportation

2011 Vehicle Registrations Summary, April 30, 2012

Iowa vehicle registration statistics by county and vehicle type produced by Iowa Department of Transportation

2012 Vehicle Registrations by County, January 2013

Iowa vehicle registration statistics by county and vehicle type produced by Iowa Department of Transportation

2013 Vehicle Registrations by County, October 16, 2014

Iowa vehicle registration statistics by county and vehicle type produced by Iowa Department of Transportation

2014 Vehicle Registrations by County, May 20, 2015

Iowa vehicle registration statistics by county and vehicle type produced by Iowa Department of Transportation

2015 Vehicle Registrations by County, April 2, 2016

Iowa vehicle registration statistics by county and vehicle type produced by Iowa Department of Transportation

Fatal Crashes & Fatalities on Iowa Rural Interstate System 1970-2014, July 24, 2015

Iowa fatal crashes and fatalities for the state of Iowa on rural interstate system from 1970-2014.

Emission Control in Diesel Engines by Alcohol Fumigation, 1990

Exhaust emissions from diesel engines are a substantial source of air pollution in this country. In recognition of this fact, the Environmental Protection Agency has issued strict new regulations due to take effect -in 1991 and 1994 that will drastically reduce the amount of some pollutants these engines will be allowed to emit. The technology is not currently available to produce diesel engines that can meet these regulations without large penalties in engine performance and efficiency. One technique that offers promise of being able to reduce emissions from both existing engines and new engines is alcohol fumigation.

Vehicle Occupancy, 1981

The purpose of the survey is to monitor trends in vehicle occupancy. These trends may reflect changes in the driving habits of the general public caused by fuel shortages and economic conditions.