Institute of Transportation Engineers (ITE):
www.ite.org
International Municipal Signal Association (IMSA):
www.imsasafety.org
California Energy Commission:
www.energy.ca.gov
Traffic Signal Association (California) (TSA):
www.tsa.cc
California Department of Transportation (Caltrans) Approved Product List:
www.dot.ca.gov/hq/esc/approved_products_list
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