In the Fifties and Sixties American dirt track motorcycle racing fans' attention was focused on half-mile and mile oval flat track races and the occasional TT race looped inside the half-mile tracks to include a jump. There were a few "scramble" races on tracks but the surfaces were graded and smoothed so they were more-or-less flat track races with a few more left hand turns and a jump or two. Motocross, as we know it today was the sport of Europeans...