Signals that the track is not safe to proceed at racing speeds. See the Flag Information page for more information on our flag construction. Add $1 shipping per flag. (Photo of Warren Alston, starter for NASCAR Busch Grand National, North Series at New Hampshire International Speedway.) Caution FxxY$20.00 Flag Size: 25x2525x3030x3020x25 (Special Order) ©1998-2010 Dynamic DeZigns.