Question:  My City has recently installed a new traffic signal.  There is a curve in the southbound approach that limits the visibility of the signal heads.  How do I know if I need a Supplemental head or not?    

 

Answer:  Chapter 4 of the California MUTCD has your guidance.  First determine your travel speed on the approach.  Then look up the minimum visibility requirement in Table 4D-1 of the CA MUTCD http://www.dot.ca.gov/hq/traffops/signtech/mutcdsupp/pdf/camutcd/CAMUTCD-Part4.pdf  . ...


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