(a) Lawful businesses and points of interest and cultural, educational, and religious facilities are eligible for official business directional signs, subject to the provisions of this chapter and to rules and regulations promulgated by the Travel Information Council, and subject further to any federal law, rule, or regulation affecting the allocation of federal highway funds or other funds to or for the benefit of this State or any agency or subdivision thereof of the State.
(b) Notwithstanding any provision of this chapter, brown-and-white official business directional signs as requested by the local byways organization may be allowed for the purpose of directing travelers to interpretive information sites along officially designated State and federal byways only. An official business directional sign authorized under this subsection shall be located on the same State-designated byway as the interpretive information site to which the sign directs attention.