In each biennium, highway fund appropriations, including costs of collections of the department of safety, shall be subject to the following limitations:
I. Department of transportation: Not less than 73 percent of anticipated total gross road toll and motor vehicle fees and fines for the biennium.
II. Department of safety: Not to exceed 26 percent of total anticipated gross road toll and motor vehicle fees and fines for the biennium.
III. All other agencies: Not to exceed 1 percent of total anticipated gross road toll and motor vehicle fees and fines for the biennium.