Ohio Rev. Code § 5595.11
The exercise of the powers granted by this chapter is in all respects for the benefit of the people of the state, for the increase of their commerce and prosperity, and for the improvement of their health and living conditions, and, as the completion of transportation improvements by a regional transportation improvement project constitute the performance of essential governmental functions, neither the project nor the governing board may be required to pay any state or local taxes or assessments upon any improvement, or upon revenue or any property acquired or used by the governing board of the project under this chapter, or upon the income therefrom. The securities issued under this chapter, their transfer, and the income therefrom, including any profit made on the sale thereof, shall at all times be free from taxation within the state.
R.C. § 5595.11