Any private entity seeking authorization under this article to acquire, construct or improve a transportation facility shall first submit a conceptual proposal as set forth in section five of this article: Provided, That notwithstanding any provision of this code to the contrary, the division has no duty to accept, consider or review a conceptual proposal that is not solicited by the division. The private entity may initiate the approval process pursuant to subsections (a) and (b) of said section or the division may alternatively request proposals pursuant to subsection (c) of said section.