The following words and terms as used in this Act shall have the following meanings:
(a) The word "Authority" shall mean The Illinois State Toll Highway Authority.(b) The word "person," shall mean any individual, firm, association, partnership, corporation, trustee or legal representative.(c) The word "owner," shall include all individuals, copartnerships, firms, associations, corporations, trustees or legal representatives, and others having any title or interest in any property, rights or easements authorized to be acquired by this Act.(d) The words "toll highway" or "toll highways," shall mean such highways as are so designed and constructed, in the best professional judgment of the engineering staff responsible, as to accomplish the purposes of this Act.(e) The word "toll" or "tolls" shall mean the compensation to be paid to The Illinois State Toll Highway Authority for the privilege of using any toll highway, or portions or parts thereof, by vehicular or other traffic.(f) The word "cost" as applied to a toll highway shall embrace the cost of construction, including bridges over or under existing highways and railroads, the cost of acquisition of all land, rights of way, property, rights, easements and interests acquired by the Authority for such construction, the cost of demolishing or removing any buildings or structures on land so acquired, including the cost of acquiring any lands to which such buildings or structures may be moved, the cost of diverting highways, interchange of highways, access to roads to private property, including the cost of lands or easements therefor, the cost of all machinery and equipment, financing charges, interest prior to and during construction, and for one or more years after completion of construction, cost of traffic estimates and of engineering and legal expenses, plans, specifications, surveys, estimates of cost and revenues, other expenses necessary or incident to determining the feasibility or practicability of constructing any such toll highway, administrative expenses and such other expense as may be necessary or incident to the construction of the toll highway, the financing of such construction and the placing of the highway in operation.