When one vehicle is towing another and the connection consists of a chain, rope, or cable, the connection must display a white, red, yellow, or orange flag or cloth not less than 12 inches square.
Minn. Stat. § 169.82
(2720-274) 1937 c 464 s 124; 1939 c 430 s 26; 1943 c 226 s 2; 1945 c 207 s 8; 1971 c 491 s 33; 1973 c 10 s 1; 1988 c 636 s 11; 1993 c 187 s 18; 1996 c 455 art 3 s 20; 1998 c 403 s 16; 2008 c 350 art 1 s 46