Safety evaluation of the removal of not-needed traffic signals

In 1993 and 1994, the Civil Engineering Department at Mississippi State University and the Traffic Engineering Division of the Mississippi Department of Transportation conducted a research project in which 141 intersections with marginally-warranted traffic signals were evaluated. Following each evaluation, the Mississippi Department of Transportation decided to either upgrade the existing traffic signal or remove the signal control and install a two-way or four-way stop sign control. The goal of this project is to examine a 36-month before-and-after accident history for each intersection in order evaluate the impact of changing the intersection control. This study focuses on a statistical analysis of the before-and-after accident histories at the 84 intersections where traffic signals were removed and replaced with either a two-way or four-way stop sign control.