Modern traffic lights are an American invention.Red-green systems were installed in Cleveland (1)...in...........

1914.Three-coour signas were (2)..........installed ..........in New York in 1918.They used (3).....to........be operated by hand from a tower in the middle of the street.The first lights of this type appeared in Lon Don,on the junction between St.James Street (4).......and.........Piccaadily,in 1925.Automatic signals were installed a year late.In the past,traffic used to (5).....be.......very special.In New York,some lights used to (6)....have........a statue on top.In Los Angeles,the (7)..........lights.........did not just change silently,but would ring bells to wake the sleeping motorists of the 1930s.These are gone and have been replaced by modern systems that (8)..........are.......seen everywhere now.