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Federal Highway Administration
     http://www.fhwa.dot.gov/
US Department of Transportation
     http://www.dot.gov/
State Transportation Department Web Sites
     http://www.fhwa.dot.gov/webstate.htm
Texas DOT QPL List for LED Signal Lamps
     ftp://ftp.dot.state.tx.us/pub/txdot-info/gsd/pdf/to7057preq2.pdf
California QPL List for LED Signal Lamps
     http://www.dot.ca.gov/hq/esc/approved_products_list/APL.pdf
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