Ohio Revised Code Title LV. Roads Highways Bridges § 5526.07

(A) Except for any firm providing professional services that relate to research or training, right-of-way acquisition services, or services to assist the department of transportation in the administration of contract claims, a firm that renders professional services to the department, during the period of the performance of professional services for the department and for any other period of time specified in a contract with the department, shall have and maintain, or be covered by, a professional liability insurance policy or policies with a company or companies that are authorized to do business in this state and that afford professional liability coverage for the professional services rendered. The insurance shall be in an amount considered sufficient by the director of transportation.

(B) The requirement to have or be covered by professional liability insurance under division (A) of this section may be waived by the director for good cause.