a. The word “commission” shall mean the Gloucester county tunnel commission hereinafter provided for or, if said commission shall be abolished, any board or officer succeeding to the principal functions thereof or upon whom the powers given by this chapter to said commission shall be given by law.

b. The word “tunnel” shall be deemed to include all property, rights, easements, and franchises relating thereto and deemed necessary or convenient for the operation thereof, and to include the approaches thereto.

c. The term “cost of the tunnel” shall embrace the cost of construction, including the amount to be paid under any contract for such construction which may theretofore have been entered into by any person, firm or corporation whose property, rights, easements, choses in action and franchises shall be acquired by the commission or by the county, and shall also embrace the cost of all land, property, real and personal, rights, easements, choses in action, and franchises acquired which are deemed necessary for such construction, the cost of all machinery and equipment, financing charges, interest prior to and during construction and for six months after completion of construction, cost of traffic estimates and of engineering and of legal expenses, plans, specifications, surveys, estimates of cost and of revenues, other expenses heretofore or hereafter incurred and necessary or incident to determining the feasibility or practicability of the enterprise, administrative and other expenses of the commission, and such other expenses as may be necessary or incident to the financing herein authorized and the construction of the tunnel and the placing of the same in operation.

d. The word “owner” shall include all individuals, incorporated companies, copartnerships, societies or associations having any title or interest in any property, rights, easements or franchises authorized to be acquired by this chapter.