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I got a result from Florida ADAPS. They were studying supplemental pedestal traffic signals. They were only studying supplement traffic signals with overheads for awareness of drivers stopping at them. The sad part is that the state will not make supplemental traffic signals standard in Florida because they are less helpful with overhead traffic signals. www.dot.state.fl.us/research-center/Completed_Proj/Summary_TE/FDOT_BDK83_977-09_rpt.pdf The pedestal traffic signal study can be found on Chapter 4, page 25.