The requirements for wide turn signs on the rear of 53' trailers are covered in the following state statutes: Maine Revised Statutes, Title 29-A, Chapter 21, Subchapter 2, § 2390, Maximum length limits. Refer to paragraph 1, letter J, number (5). Maryland Transportation Code, Title 24, Subtitle 1, § 24.104.2, Length of semitrailer operated in combination with truck tractors. Refer to paragraph (c)(7).