In order to discuss the issue of highway fatalities, it is crucial to understand the differences between the terms "fatalities," "fatality rate," and the "fatal accident rate."
A high-tech computerized system of controlling the timing of traffic signals in Macomb County, Michigan saved drivers approximately $2 million in gasoline costs.
A study in Oakland County, Michigan showed that retiming the traffic signals had a benefit-cost ratio of 175:1 and 55:1 respectively for each of the two phases of the project.