99- 420 C.M.R. ch. 3, § 1
The Manual on Uniform Traffic Control Devices for Streets and Highways (MUTCD) is the national standard for traffic control devices on all roads open to public travel. The MUTCD (http://mutcd.fhwa.dot.gov/) contains the standards for signing freeways and expressways for motorists who are unfamiliar with an area. The MUTCD incorporates by reference the American Association of State Highway and Transportation Officials (AASHTO) Guidelines for the Selection of Supplemental Guide Signs for Traffic Generators adjacent to freeways.
P.L. 2014 c. 549, 'An Act to Allow Signs for Areas of Local, Regional and Statewide Interest on the Interstate System' was modeled on AASHTO guidance on the most appropriate generators for display on interstate highway supplemental guide signs. Section two of that act, codified at 23 M.R.S.A. §1912-C, sets out standards for supplemental guide signs on the Maine Turnpike.
99- 420 C.M.R. ch. 3, § 1