The department shall prepare and submit to the Governor a proposed budget. The department shall include, within the proposed budget, the portion of that budget that is to be funded from the State Highway Account.

The department shall inform the commission of all pertinent assumptions and policy directions it intends to use in preparing the budget. This information shall be forwarded to the commission as soon as available. The commission shall review the assumptions and policy directions used in preparing the budget and forward its comments and recommendations to the department.