(Portland, OR)  --  Traffic in Portland is among the most congested in the nation.  That's according to the TomTom Travel Index for 2014, which ranks Portland's traffic congestion the ninth-worst in the U.S.  Topping the list is Los Angeles, with San Francisco, Seattle, San Jose', and New York rounding out the top five.  The TomTom Traffic Index says it takes Portland-area drivers more than 20-percent longer to reach their destinations during peak times than when traffic is flowing freely.