ThetrafficsignalsalongFactoriaBoulevardinBellevue,Washi...
问题详情：ThetrafficsignalsalongFactoriaBoulevardinBellevue,Washington,generallydon'tflashthesamelengthofgreentwiceinarow,especiallyatrushhour.At9:30am,thefullred/yellow/greensignalcyclemightbe140secon...