N.J. Stat. § 27:7-42
The commissioner may set apart in any calendar year from the amount subject to expenditure in that year for state highway construction, a sum not exceeding one per cent of the amount expended by the commissioner in the preceding calendar year for construction of state highways, and may expend such one per cent or part thereof in the calendar year when the same shall have been set apart, together with such additional amounts as may be voluntarily contributed by private parties, in the planting and care of trees and shrubbery in and along state highways, in removing unsightly objects therefrom, and in otherwise effecting highway beautification.
The money so set apart shall be expended under the supervision of a competent landscape architect, to be employed by the commissioner for that purpose.
N.J.S. § 27:7-42