Traffic signed Island Music LTD contract autograph by Chris Wood, Jim Capaldi, and Steve Winwood. May 15, 1967. 9x12 inches Traffic were an English rock band, formed in Birmingham,[1] in April 1967 by Steve Winwood, Jim Capaldi, Chris Wood and Dave Mason.[2] They began as a psychedelic rock group and diversified their sound through the use of instruments such as keyboards, like the Mellotron and harpsichord, sitar, and various reed instruments, and by incorporating jazz and improvisational techniques in their music.