Pavement Markings and Safety Final Report, November 2010

Previous research on pavement markings from a safety perspective tackled various issues such as pavement marking retroreflectivity variability, relationship between pavement marking retroreflectivity and driver visibility, or pavement marking improvements and safety. A recent research interest in this area has been to find a correlation between retroreflectivity and crashes, but a significant statistical relationship has not yet been found. This study investigates such a possible statistical relationship by analyzing five years of pavement marking retroreflectivity data collected by the Iowa Department of Transportation (DOT) on all state primary roads and corresponding crash and traffic data. This study developed a spatial-temporal database using measured retroreflectivity data to account for the deterioration of pavement markings over time along with statewide crash data to attempt to quantify a relationship between crash occurrence probability and pavement marking retroreflectivity. First, logistic regression analyses were done for the whole data set to find a statistical relationship between crash occurrence probability and identified variables, which are road type, line type, retroreflectivity, and traffic (vehicle miles traveled). The analysis looked into subsets of the data set such as road type, retroreflectivity measurement source, high crash routes, retroreflectivity range, and line types. Retroreflectivity was found to have a significant effect in crash occurrence probability for four data subsets—interstate, white edge line, yellow edge line, and yellow center line data. For white edge line and yellow center line data, crash occurrence probability was found to increase by decreasing values of retroreflectivity.

Pavement Markings and Safety,

This study explores the statistical relationship between crash occurrence probability and longitudinal pavement marking retroreflectivity. Problem Statement Previous research on pavement markings, from a safety perspective, tackled various issues, such as pavement marking retroreflectivity variability, relationship between pavement marking retroreflectivity and driver visibility, and pavement marking improvements and safety. A recent research interest in this area is to find a correlation between retroreflectivity and crashes, as a significant statistical relationship is undefined to date.

Industrial-economic survey of Clinton, Iowa, and the surrounding area,1960.

This is an "Industrial-Economic Survey" of Clinton, Iowa and the surrounding area that was compiled and assembled for the use of any manufacturing of commercial organization which has in interest in setting up operations in the general Clinton area. Facts and statistics are shown to use for location analysis. Numerous photos and maps are included.

Uniform Crime Reports as a Vehicle For Reporting State Wide Data on Domestic Violence and Sexual Assault, April 1998

This project is part of an effort conducted by the Justice Research and Statistics Association (JRSA) under a grant whose objective is to provide states with descriptions of existing methodologies to collect Domestic Violence (DV) and Sexual Assault (SA) data. JRSA has identified three different methodologies to collect such data: · Incident-based reporting as part of the Uniform Crime Reports · Specialized data collection from law enforcement through a separate data collection system · Specialized data collection coming directly from service providers. One state has been selected as an example of each type of data collection above, with Iowa selected as a representative of states with incident based reporting (IBR) as part of the UCR system.

Connecting Iowa’s Disproportionate Minority Confinement Efforts to the Iowa Justice Data Warehouse, 2002

Funds for this report and grant were provided to the Iowa Division of Criminal and Juvenile Justice Planning (CJJP) and Statistical Analysis Center, by the Justice Research and Statistics Association (JRSA) through a cooperative agreement entitled “Juvenile Justice Evaluation Resource Center” with the Office of Juvenile Justice and Delinquency Prevention (OJJDP), U.S. Department of Justice (DOJ).

Iowa Board of Nursing Annual Report, July 12, 2004-June 30,2005

Annual report of the Iowa Board of Nursing. Includes information on legislation, rule changes, and statistics related to all aspects of board business: education, continuing education, enforcement, administrative changes, financial report and general nursing demographics.

The Iowa Perinatal, April-May-June 2004, Vol. 15, no.2

This newsletter from The Department of Public Health about perinatal health care and statistics.

The Iowa Perinatal, January-February-March 2005, Vol. 26, no.1

This newsletter from The Department of Public Health about perinatal health care and statistics.

The Iowa Perinatal, April-May-June 2005, Vol. 26, no.2

This newsletter from The Department of Public Health about perinatal health care and statistics.

The Iowa Perinatal, July-August-September 2005, Vol. 26, no.3

This newsletter from The Department of Public Health about perinatal health care and statistics.

The Iowa Perinatal, October-November-December 2005, Vol. 26, no.4

This newsletter from The Department of Public Health about perinatal health care and statistics.

The Iowa Perinatal Letter, January-February-March 2006, Vol. 27, no.1

This newsletter from The Department of Public Health about perinatal health care and statistics.

The Iowa Perinatal Letter, April-May-June 2006, Vol. 27, no.2

This newsletter from The Department of Public Health about perinatal health care and statistics.

The Iowa Perinatal Letter, April-May-June 2004, Vol. 25, no.2

This newsletter from The Department of Public Health about perinatal health care and statistics.

The Iowa Perinatal Letter, July-August-September 2006, Vol. 27, no.3

This newsletter from The Department of Public Health about perinatal health care and statistics.