Notwithstanding the provisions of section 499 of this title, the Council shall not issue more than four licenses for official business directional signs for any one place of business eligible therefor under section 490 of this title, not more than one of which is visible to traffic moving in any one direction on any one highway leading to the place, unless the Travel Information Council finds that enforcement of this subsection will be unreasonable and will result in unnecessary hardship to the applicant. (Added 1967, No. 333 (Adj. Sess.), § 11, eff. March 23, 1968; amended 1969, No. 92, § 8, eff. April 19, 1969.)