This study extends the previous work of Burkey and Obeng (2004) that examined the impact of red light cameras on the type and severity of crashes at signalized intersections in Greensboro, NC. The extension takes the following form. First, we extend the data to cover 57 months, and to include...

This is an update to the October, 2003 version of this report. Using the latest available data, we include an additional 12 months of accident data. Additionally, several data coding errors were discovered in the original data set, and corrected for this report. Therefore, results from the...

This study extends the previous work of Burkey and Obeng (2004) that examined the impact of red light cameras on the type and severity of crashes at signalized intersections in Greensboro, NC. The extension takes the following form. First, we extend the data to cover 57 months, and to include...

Studies on welfare programs in the United States have identified three types of welfare migration (employment, benefit, and amenity-related). This paper introduces a fourth type of migration induced by welfare time limits. After a welfare-dependent family runs out of benefits, it is possible for...

This brief note provides a simple, yet powerful example of how the marginal cost/marginal benefit principle can be used in everyday life. Using the decision of the optimal choice of speed on the highway, this note was developed for use as one of the first readings in an introductory...

Abstract: The Insurance Institute for Highway Safety mailed an essay written by Richard Retting and Sergey Kyrychenko (IIHS, 2005) to many universities and individuals where they accused my coauthor and me of being Junk Scientists. This has become a typical pattern for the IIHS, attacking every...

Policy in many regions restricts geographic access to alcohol by reducing the number of outlets where alcohol is available for purchase. In previous studies imprecise measures of access and the lack of a theoretical framework has caused improper economic interpretations of how reducing access...

The paper introduces the subject of terrorism and counterterrorism by means of a two-person bimatrix game that provides some insight into the behavior of the two players. We then examine three important areas in counterterrorism tasks: the detection of terrorist cells and how to render them...

Payday lending is a relatively new and fast growing segment of the “fringe banking” industry. This paper offers a comparative, descriptive analysis of the location patterns of traditional banks and payday lenders. Utilizing a dataset at the Zip Code Tabulation Area level in North Carolina,...

This note documents the method for calculating Gini Coefficients in R using 2000 Census data. Many people have use this method for computing Ginis for ZCTA’s for example. You can find these estimates for both the 50 states, as well as all US counties and additional information about Gini...