In addition to the exercise of the power of eminent domain prior to the entry upon land being condemned, as provided in this article, the Commissioner of Highways is authorized to acquire title and to enter upon and take possession of such property and rights-of-way, for the purposes set out in § 33.2-1001, as the Commissioner of Highways may deem necessary, and proceed with the construction of such highway, such taking to be made pursuant to §§ 33.2-1019 through 33.2-1029.1. It is the intention of this article to provide that such property and rights-of-way may, in the discretion of the Commissioner of Highways, be condemned during or after the construction of the highway, as well as prior thereto, and to direct the fund out of which the judgment of the court in condemnation proceedings shall be paid, and to provide that in all other respects the provisions of this article shall apply, whether the property and rights-of-way are condemned before, during, or after the construction of the highway. However, the authorities constructing such highway under the authority of this article shall use diligence to protect growing crops and pastures and to prevent damage to any property not taken. So far as possible all rights-of-way shall be acquired or contracted for before any condemnation is resorted to.