Evaluation of Revised Left Turn Signalization

摘要

Modified left turn signals had shown cost savings over the old style of trafficsignals in initial installation and maintenance. This evaluation was conducted to determine whether those savings would be justified by no increase in the accident rates at the intersections where the new signals were installed. Eighteen intersections were selected for the evaluation and their accident rates before and after the new signal installation were compared. The results were statistically inconclusive, but since there was no indication of a significant rise overall in the accident rates, the evaluation committee determined that the savings already demonstrated would justify continuing to install the new signals.